Wednesday
May 22, 2013

# Homework Help: Math: Trigonometry

TRIGONOMETRY
Can someone please give me a step by step answer on how to find the complex cube roots of 8(cos(4π/5)+isin(4π/5))? I need to know how to do this for my trig final next week.
Friday, May 17, 2013 at 5:01pm

TRIGONOMETRY
I don't understand how to convert -3-4i to polar coordinates. I need to know how so I am ready for my trig final next year. Can someone please show me step by step how to solve this? Thanks
Friday, May 17, 2013 at 3:31pm

TRIGONOMETRY
Can someone please show me step by step how to calculate the modulus and the argument for these complex numbers? I have a trig final next week and I am trying to finish this study guide so I am prepared. Thank you so much! If you can, please show my how you get the answer so I...
Friday, May 17, 2013 at 9:11am

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each ...
Thursday, May 16, 2013 at 11:29am

TRIGONOMETRY
Can you check my work, please? This is for a trig study guide for my final next week. I'd like to know if I'm doing this right. :) 2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) ...
Thursday, May 16, 2013 at 11:26am

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
Thursday, May 16, 2013 at 11:13am

trig
Sinxcosy(cotxtany-1)
Wednesday, May 15, 2013 at 12:16pm

trig
Sinxcosy(cotxtany-1)
Wednesday, May 15, 2013 at 12:15pm

trig
There are 15,000 endive lettuce seeds in an ounce and 300 seeds in a packet. The seeds cost \$1.50 per packet. What is the cost, in dollars, of one ounce of seeds?
Wednesday, May 15, 2013 at 10:04am

trig
if 5cos A plus 3=0 and 180<A<360..without using a calculator and with the aid of a diagram,determine the value of 1.1 sinA plus cosA 1.2 tanA *sinA
Monday, May 13, 2013 at 11:52am

Trig
The postal service places a limit of 84 inches on the combined lenght and girth (distance around) of a package to be sen parcel post. What Dimensions of a rectangular box with square cross-section will contain the largest volume that can be mailed?
Sunday, May 12, 2013 at 11:32pm

TRIG
in an arithmetic sequence a1=4 and d=8 which term is 428 Show your work
Saturday, May 11, 2013 at 8:32pm

TRIG
what is the explicit formula for the sequence 3,7,11,15
Saturday, May 11, 2013 at 8:30pm

TRIG
determine the sum of the first 100 even integers SHOW YOUR WORK
Saturday, May 11, 2013 at 8:29pm

TRIG
the population of a certain city is 1.3 million people. if the population is growing at the rate of 4% per year what will the population be in 8 years
Saturday, May 11, 2013 at 8:28pm

TRIG
What is the 6th term of the geometric series with a1= -5 and r=2.5
Saturday, May 11, 2013 at 8:25pm

trig identites
since sin2x+√3cos2x=2sin(2x+60) find the general solution for the equation sin2x+√3cosx=0 thank you
Friday, May 10, 2013 at 7:35pm

math
simplify sin(540-2x) this is to do with trig
Friday, May 10, 2013 at 10:13am

Trig
Verify the identity. (secx + tanx)/(secx - tanx) = (1 + 2sinx + sin(^2)x)/cos(^2)x
Thursday, May 9, 2013 at 2:16pm

Trig
Verify the identity. 1/(tanx-secx) + 1/(tanx+secx) = -2tanx
Thursday, May 9, 2013 at 1:54pm

math trig
If a ferris wheel with a 20.5 meter radius, how high would one car be from the loding dock at these given angles trveled by the rider?: 90 135 180 225 270 315 405 450 495 and 540?
Thursday, May 9, 2013 at 10:40am

math trig
If a ferris wheel has a radius of 20.5meters, how tall would a 45 degree angle be?
Thursday, May 9, 2013 at 10:28am

Honors Trig
a plane is flying in the direction of 190 degrees with an air speed of 400 mph. Its course and ground speed are 200 degrees and 350 mph respectively. What is the speed and direction of the wind?
Wednesday, May 8, 2013 at 6:30pm

trig
The angle of depression as measured from the top of a 41 foot tower to a reference point on the ground is 65 degrees. How far away, to the nearest foot, is the reference point from the base of the tower?
Wednesday, May 8, 2013 at 2:41pm

Trig
Use sum and difference identitites to find the exact value of co 15 degrees
Wednesday, May 8, 2013 at 11:56am

trig identities
Find the exact value of cos (2theta) given csc theta = 8/3 and 0 < theta < pi/2
Wednesday, May 8, 2013 at 1:02am

trig
find the minimum and maximum value of sin100 degree plus cos100 degree
Tuesday, May 7, 2013 at 4:36pm

trig
If a flywheel 8 ft. in diameter rotates at 80 rpm., what is the linear velocity of a point on the outside edge, in feet per minute in terms of pi?
Tuesday, May 7, 2013 at 9:43am

Trig
cos[(tan^-1(3/4))+(cos^-1(9/41))]
Monday, May 6, 2013 at 10:10pm

Trig
csc thea= -2, quadrant 4. what are the six trig functions?
Monday, May 6, 2013 at 4:17pm

trig
A slide is attached to the side of a tree house. The height of the tree house is 6 less than double the distance from the baswe of the tree to the base of the slide. The length of the slide is 3 more than the height of the tree house. Find the length of the slide.
Sunday, May 5, 2013 at 9:00pm

Prove the identity: cos^4 x + sin^4 x = 1 - (1/2)sin^2 (2x)
Sunday, May 5, 2013 at 11:16am

Trig(I think)
Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 1m/s, how fast is the area of the spill increasing when the radius is 30m?
Monday, April 29, 2013 at 8:02pm

trig
at one point in the day, a tower that is 150 feet high casts a shadow that is 210 feet long. Find, to the nearest tenth of a degree, the angle of elevation of the sun at that point
Sunday, April 28, 2013 at 12:10pm

trig
cos(t)=3/5 determine the exact value of t to the nearest degree
Saturday, April 27, 2013 at 3:39pm

trig
solve the point given below is on the terminal side of an angle0. find the exact value of the six trigonometric functions of 0. (10,-10)
Saturday, April 27, 2013 at 2:27pm

trig
how many solutions (answers) does this equation has? sinx=sin1
Saturday, April 27, 2013 at 1:53pm

trig
how to do this? how much does this equals? 2cos160*cos140*cos100
Saturday, April 27, 2013 at 1:49pm

trig
Wednesday, April 24, 2013 at 1:45pm

trig
Wednesday, April 24, 2013 at 1:45pm

Trig
A parabola has its vertex on the graph of the line y=3x+1 and passes through (1,10). If it is the same size,? shape, and direction as the graph of y=3x^2, find the equation (s) of all possible parabolas Thanks!!!
Wednesday, April 24, 2013 at 6:39am

Trig
Convert 2xy = 1 to polar form.
Monday, April 22, 2013 at 7:04pm

Trig
Rewrite -2x^2 + sqrt(3)xy - y^2 +2 = 0 with the xy term eliminated. Round terms to nearest hundredth.
Monday, April 22, 2013 at 6:39pm

trig
A kite is in the shape of a quadrilateral with two pair of congruent adjacent sides. The lengths of two sides are 20.0 inches and the lengths of the other two sides are 35.0 inches. The two shorter sides meet at an angke of 115 degrees. A. Find the length of the diagonal ...
Sunday, April 21, 2013 at 6:09pm

trig
Two tracking stations are on the equator 135 miles apart. A weather balloon is located on a bearing of N 37 degrees E from the weastern station and on a bearing of N 19 degrees E from the eastern station. How far is the balloon from the weastern station?
Sunday, April 21, 2013 at 3:32pm

trig
A pole is braced by two wires that extended from the top of the pole to the ground. The lengths of the wires are 16 feet and 18 feet and the measure of the angle between the wires is 110 degrees. Find, to the nearest foot, the distance between the points at which the wires are...
Sunday, April 21, 2013 at 2:45pm

Trig
A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.
Sunday, April 21, 2013 at 1:05pm

Prove the following: sin(x+y)sin(x-y) = cos^2 (y) - cos^2 (x)
Sunday, April 21, 2013 at 11:47am

Trig
This has to do with vectors...I'm wondering if I set up the diagram correctly? A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane?
Saturday, April 20, 2013 at 4:50pm

Trig
This has to do with dot products (I can't make the arrow above the u, i, or j). Given u = 4i - 6j and v = -3i + 5j, find 4u-(1/2)v Am I just supposed to plug in what u and v are equal to in 4u-(1/2)v? If so, is the answer (35/2i - 53/2j)
Saturday, April 20, 2013 at 4:15pm

trig
Solve exactly over the indicated interval: 2sinx+cscx=3, 0<theta<360
Thursday, April 18, 2013 at 12:03am

Trig
A 12 foot ladder leans against a building. The top of the ladder leans against the wall 10.5 feet from the ground. What is the angle formed by the ground and the ladder? Assume its a right triangle.
Wednesday, April 17, 2013 at 11:52pm

Trig
solve over the indicated interval expressed in degrees to 2 decimal places. sec(theta/2)=1.4275, 0<theta<360degrees
Wednesday, April 17, 2013 at 11:25pm

trig
solve exactly over the indicated interval: cot(theta)=0, all real numbers
Wednesday, April 17, 2013 at 9:33pm

trig
Find minimum value of 2cos x + 2cos y
Wednesday, April 17, 2013 at 8:31am

trig
Find minimum value of 2cos x + 2cos y
Wednesday, April 17, 2013 at 8:28am

trig
Find minimum value of 2cos x + 2cos y
Wednesday, April 17, 2013 at 8:27am

Math-Trig
Find all angles in degrees that satisfy each equation. tan(a)+rad3=0
Tuesday, April 16, 2013 at 5:32pm

Trig
From a certain distance from the base of a Giant Sequoia tree a surveyor determines that the angle of elevation to the top of the tree is 47deg. The surveyor then walks 100 feet away from the tree and determines that the angle of elevation to the top of the tree is now 37deg. ...
Tuesday, April 16, 2013 at 5:06pm

Trig
Rewrite 6x^2 - sqrt(3)xy + 5y^2 - 9 = 0 with the xy term eliminated.
Tuesday, April 16, 2013 at 12:12pm

Trig
Convert this equation so that it could be entered into a calculator in the standard y= format. x^2 - 4xy + 4y^2 - 8y + 2 = 0
Tuesday, April 16, 2013 at 12:11pm

Trig
Solve the multiple-angle equation. (Enter your answers as a comma-separated list. Let n be any integer. Enter your response in radians.) sec 9x = 2
Monday, April 15, 2013 at 8:47pm

math
In right triangle ABC, a = 52 ft and c = 63 ft. Which of the following trig ratios of angle B, would combine the given sides?
Sunday, April 14, 2013 at 4:57pm

Maths-trig
Prov tht 1-sin2X/sinX-cosX=sinX-cosX
Friday, April 12, 2013 at 3:11pm

trig
an airplane has an airspeed of 430 miles per hour at a bearing of 135 degrees. the wind velocity is 35 miles per hour in the direction N30degreesE. Find the resultant speed and direction of the plane.
Friday, April 12, 2013 at 1:25pm

trig
What happens when you try to elevate sin-1(3/2)?
Thursday, April 11, 2013 at 5:19pm

Precalc with Trig
What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0
Thursday, April 11, 2013 at 2:04pm

Math
sec(alpha) = -4(√(5))/5 find exact values at alpha for the remaining five trig functions
Wednesday, April 10, 2013 at 5:46pm

trig
Solve rounding to 2 decimal places. 9cosx + 4cos(2x) + 1 = 0 over 0° ≤ x < 360° Thanks to anyone that can help! I'm totally stumped.
Wednesday, April 10, 2013 at 2:40pm

Trig
Solve exactly over 0 ≤ θ < 2π secx + tanx = 1
Wednesday, April 10, 2013 at 2:24pm

trig
GIVEN THE ANGEL ALFA WITH COS ALFA = -1/a. IF ALFA IN QUADRANT TWO, THE VALUE OF SIN ALFA IS....
Wednesday, April 10, 2013 at 12:42pm

trig
i need to know how to do evaerything because i am stupid
Wednesday, April 10, 2013 at 9:39am

applied calculus
3. a) Write out the limit definition for the derivative of y = xx. Attempt to solve it. b) Write out the limit definition for the derivative of the inverse trig function from question 2. Attempt to solve it. c) Discuss the value of implicit differentiation. (Use questions 1 ...
Tuesday, April 9, 2013 at 9:26pm

applied calculus
Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.
Tuesday, April 9, 2013 at 9:25pm

Physics
Please help! I've tried solving this with trig but I can't seem to figure out what I've been doing wrong. Two positive point charges, each of which has a charge of 2.3 × 10−9 C, are located at y = +0.60 m and y = −0.60 m. A)Find the magnitude of ...
Tuesday, April 9, 2013 at 7:25pm

Applied calculas
3. a) Write out the limit definition for the derivative of y = xx. Attempt to solve it. b) Write out the limit definition for the derivative of the inverse trig function from question 2. Attempt to solve it. c) Discuss the value of implicit differentiation. (Use questions 1 ...
Monday, April 8, 2013 at 5:32pm

Applied calculas
Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.
Monday, April 8, 2013 at 5:31pm

Trig
Solve the equation on 0° ≤ θ < 360° and express in degrees to two decimal places. sin(2θ) = -0.7843 I've gotten 308.345° (QIV) and 231.655° (QIII). I'm unsure how to get the answer though? The final answer is: 115.83°, 295.83°...
Monday, April 8, 2013 at 3:14pm

trig
I am trying to get wxMaxima to give me arcsin(4/5), either in radians or degrees. I am using a: 4/5\$ b:asin(a)\$ print("the angle is ", b)\$ But it returns the angle is asin(4/5) How do I get wxMaxima to give me the angle? I want .927 radians or 53.1 degrees.
Monday, April 8, 2013 at 1:06pm

trig
if sin 41'=m. write m in terms of cos 41'
Monday, April 8, 2013 at 9:24am

Trig
Find the exact values of sin 2 theta, cos 2 theta and tan 2thea using the double angle formula sin theta = 3/4 , pi/2 < theta < pi
Monday, April 8, 2013 at 2:31am

trig
i nead to find to the nearest degree all values of theta in the interval 0 x 360 that satisfy the equation 3 cos 2 theta+ sin theta-1=0
Sunday, April 7, 2013 at 10:33pm

Trig
Solve the trig equation exactly over the indicated interval. tanθ = 0, all real numbers I know the answer is πn, but I don't understand how they got this. I get that tanθ = 0 on π and 2π on the unit circle, so did they just put n on the end of &#...
Sunday, April 7, 2013 at 1:48pm

Precalc with Trig
What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0
Sunday, April 7, 2013 at 1:42pm

Precalculus with Trig
Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))
Sunday, April 7, 2013 at 1:38pm

trig
If it is given that tan(A-B)=tanA-tanB/1+tanAtanB and tanP-1/1+tanP=tan195 find p
Saturday, April 6, 2013 at 3:44pm

trig
Indoor steps generally are steeper and have smaller landings. A staircase has a 9 inch vertical rise per step to get to the second floor of a house. If the angle of elevation is 36.8 degrees and there are 16 feet of horizontal space total for each of the landings combined, ...
Wednesday, April 3, 2013 at 1:34pm

Trig
Sin^2 b(1 +cot^2 b) =1
Wednesday, April 3, 2013 at 10:14am

trig
An airplane pilot wishes to maintain a true course in the direction 250° with a ground speed of 400 mi/hr when the wind is blowing directly north at 60 mi/hr. Approximate the required airspeed and compass heading
Monday, April 1, 2013 at 9:33pm

Trig
Verify that each trigometric equation is an identity. 1/1-sinx + 1/1+sinx = 2 sec^2x
Sunday, March 31, 2013 at 9:16pm

Math: Solving Trig Equation
9tan (x) - 9 sec^2 (x)/ tan (x)
Sunday, March 31, 2013 at 1:16am

Trig
Simplify (sin^2)*(67.5deg) - (cos^2)*(67.5deg) and then evaluate exactly.
Thursday, March 28, 2013 at 1:46pm

Trig
Use a half-angle identity to find the exact value for sec(x/2) if sinx = -12/13 ; 3pi/2 < x < 2pi
Thursday, March 28, 2013 at 12:27pm

Trig
How do I use the unit circle to evaluate tan(-3pi/4)
Monday, March 25, 2013 at 5:03pm

trig
Find the first two terms a_1 =5 and an=3a _n-1+2
Sunday, March 24, 2013 at 9:50pm

Trig
prove that tanA divided by the sinA equals the secA
Sunday, March 24, 2013 at 8:02pm

trig
Sandra wants to find the height of a moutain. From her first location on the ground, she finds the angle of elevation to the top of the mountain to be 35 degrees 15 minutes. After moving 1000 meters closer to the moutain on level ground, she finds the elevation to be 50 ...
Wednesday, March 20, 2013 at 1:28pm

Trig
If 180<A<270 and sinA= -radical(5)/3, find tan(1/2)A.
Tuesday, March 19, 2013 at 11:36pm

trig
I keep trying to find the power reducing formula for sin^4(x), but I can't seem to get all the fractional parts correct. The answer I should be getting is: sin^4(x)=(1/8)cos4x-(1/2)cos2x+(3/8) I can only get this far knowing feeling confident. When I go further I start ...
Tuesday, March 19, 2013 at 9:57pm

Math
What is the inverse trig function cotangent of square root of 3/3? What is the value?
Tuesday, March 19, 2013 at 5:19pm

Trig
True or False: For a trignometric function, y = f(x), then x = f^-1(y). Explain your answer. Thanks.
Tuesday, March 19, 2013 at 4:51pm

Trig
Tuesday, March 19, 2013 at 4:46pm

Trig
What is the exact value of tan(s+t) if sin(s+t)=56/65. And cos(s)=5/13 and sin(t)=4/5. Everything is in the first quadrant
Tuesday, March 19, 2013 at 3:22pm

Trig
A pulley with a diameter of 24 inches is driven by a belt which is moving 1045 ft/min. How many revolutions per minute are made by the pulley?
Tuesday, March 19, 2013 at 3:16pm

Trig
How do I find the exact value of sin (pi/24)?I am crying
Sunday, March 17, 2013 at 6:03pm

trig
How do I find the exact value of sin (pi/24)?
Sunday, March 17, 2013 at 5:11pm

Trigonometry
Hi, I really need help in understanding how to solve trig equations. How do you solve this equation? Solve the equation on the interval 0 < or equal to x < or equal to 2pi. sinx = (square root of 3)/2 I appreciate your help. Thank you!
Sunday, March 17, 2013 at 2:18pm

trig
A pole is braced with a wire from the top of a pole to the ground. The wire is 100 feet long and makes an angle of 40° with the ground. Find the height of the pole.
Friday, March 15, 2013 at 10:03am

trig
A road runs from the base of a mountain. From two points 235 meters apart on the road, the angles of elevation to the top of the mountain are 43 and 30. how high above the road is the mountaintop?
Wednesday, March 13, 2013 at 10:45pm

trig
A road runs from the base of a mountain. From two points 235 meters apart on the road, the angles of elevation to the top of the mountain are 43 and 30. how high above the road is the mountaintop?
Wednesday, March 13, 2013 at 10:29pm

trig
A road runs from the base of a mountain. From two points 235 meters apart on the road, the angles of elevation to the top of the mountain are 43 and 30. how high above the road is the mountaintop?
Wednesday, March 13, 2013 at 10:29pm

trig
cos è = 0.9659 A = ? H = 20
Wednesday, March 13, 2013 at 4:19pm

Trig
a. Form a pair of simultaneous equations by letting y1 equal the left side and y2 equal the right side of sqrt 5-x=1. b.Repeat part (a) with the equivalent equation sqrt 5=x+1 c. Repeat part (a) with the equivalent equation sqrt 5-x-1=0
Tuesday, March 12, 2013 at 1:56am

Trig
Whats the height of a flagpole if a student stand 37feet from it and determines the angle of elevation to be 34degrees and her eyes are 5.3 feet from the ground(round to the nearest whole number)
Monday, March 11, 2013 at 2:06am

Trig
the number of solutions of sin x= -sqrt3/2 for x between 0 and 2pi
Monday, March 11, 2013 at 2:02am

Trig
the height of a flagpole if a student stands 37 feet from it and determines the angle of elevation to be 34 degrees and her eyes are 5.3 feet from the ground.
Monday, March 11, 2013 at 12:46am

trig
The radian measure of an angle of 182 degrees is ?
Wednesday, March 6, 2013 at 3:43pm

trig
use an angel sum identity to verify cos2theta = -2cos^@-1
Monday, March 4, 2013 at 3:11pm

Trig
help please!: (sinx + sin2x +sin3x) / (cosx + cos2x + cos3x) = tan2x
Sunday, March 3, 2013 at 9:05pm

trig
cos(2x+4h)-cos(2x+2h)=?
Sunday, March 3, 2013 at 8:23pm

trig
cos(2x+4h)-cos(2x+2h)=?
Sunday, March 3, 2013 at 8:23pm

trig
cos(2x+4h)-cos(2x+2h)
Sunday, March 3, 2013 at 8:22pm

Trig
A plane if flying at 200 mph with a heading of 45 degrees and encounters a wind of 100 mph from the west. What is the resulting velocity and heading?
Sunday, March 3, 2013 at 6:13pm

trig
10sinB+5 = sinB+5
Friday, March 1, 2013 at 12:51pm

trig
If sin theta is equal to 5/13 and theta is an angle in quadrant II find the value of cos theta, sec theta, tan theta, csc theta, cot theta.
Thursday, February 28, 2013 at 10:44pm

trig
solve tan2x = -28/45 Thank you
Thursday, February 28, 2013 at 10:11am

trig
A population of wolves in a country is represented by the equation p(t)=80(0.98)^t, where t is the number of years since 1998. Predict the number of wolves in the population in the year 2008. how many years will it take for the population of wolves to reach 500?
Tuesday, February 26, 2013 at 8:15pm

Trig
Four wires support a 40-meter radio tower. Two wires are attached to the top and two are attached to the center of the tower. The wires are anchored to the ground 30-meters from the base of the tower. What is the total length of wire needed?
Tuesday, February 26, 2013 at 10:36am

trig
Four wires support a 40-meter radio tower. Two wires are attached to the top and two wires are attached to the center of the tower. The wires are anchored to the ground 30-meters from the base of the tower.
Tuesday, February 26, 2013 at 10:33am

trig
sec0+ten0-1/tan0+sec0+1=1+sin0/cos0
Sunday, February 24, 2013 at 4:02am

Trig identities:(
Sin4A - cos4A = sin2A - cos2A Can i just square root the left side??:O
Saturday, February 23, 2013 at 7:43pm

trig
Friday, February 22, 2013 at 7:53pm

trig sub question
Hello, I have a question concerning trigonometric substitution. let's say we have integral of dx/sqrt(9x^2 + 4), so after doing a few steps we have: 2/3 integral of sec0/sqrt((2tan0)^2 + 4*) d0 (the * is for later on) the next step turns into: 2/3 integral of sec0/(sqrt(...
Friday, February 22, 2013 at 6:30pm

trig
What is the length of side c to the nearest whole number if side a 105 and angle A 65 degrees and angle B 37 degrees?
Friday, February 22, 2013 at 5:49pm

trig
If cot x = .78, what is tan x?
Thursday, February 21, 2013 at 7:24pm

trig
Express sin4xcos3x as a sum or differences of sines and cosines
Thursday, February 21, 2013 at 4:04pm

Trig
A pendulum swings through an angle of 22 degrees each second. If the pendulum is 30 inches long, how far does its tip move each second?
Wednesday, February 20, 2013 at 10:25am

Trig
Is the angle 11pi/12 on the unit circle the same as the angle -pi/12? I'm thinking it would be, but I'm not sure.
Tuesday, February 19, 2013 at 8:51pm

trig
An object Is propelled upward at an angle θ, 45° < θ<90°, to the horizontal with an initial velocity of (Vo) feet per second from the base of a plane that makes an angle of 45° with the horizontal. If air resistance is ignored, the distance R it ...
Tuesday, February 19, 2013 at 8:35pm

trig
To determine the distance to an oil platform in the Pacific Ocean, from both ends of a beach, a surveyor measures the angle to the platform from each end of the beach. The angle made with the shoreline from one end of the beach is 83 degrees, from the other end 78.6 degrees. ...
Tuesday, February 19, 2013 at 7:50pm

trig.
8x^3+4x^2-4x solution sets
Monday, February 18, 2013 at 8:26pm

Trig
Verify the identity. cos 4x + cos 2x = 2 - 2 sin^2(2x) - 2 sin^2 x
Sunday, February 17, 2013 at 11:33pm

Trig
Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to each other externally. Find the angles of the triangle whose vertexes are the centers of the circles.
Sunday, February 17, 2013 at 9:36pm

trig
cos^(2) 20 degrees + sin^(2) 20 degrees +pi/2
Sunday, February 17, 2013 at 8:59pm

Trig
The diagonals of a parallelogram intersect at a 42◦ angle and have lengths of 12 and 7 cm. Find the lengths of the sides of the parallelogram. (Hint: The diagonals bisect each other.)
Sunday, February 17, 2013 at 8:17pm

Trig Identities
Proving identities: 1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = sin^2x - cos^2x 3) 1/cosx - cosx = sin x tan x 4) sin x + tan x =tan x (1+cos x) 5) 1/1-sin^2x= 1+tan^2 x How in the world do I prove this...please help... I appreciateyour time thankyou soo much!!
Sunday, February 17, 2013 at 10:06am

trig
a lighthouse is located at point A. a ship travels from point B to point C. At point B,, the distance between the ship and the lighthouse is 7.5km. At point C the distance between the ship and the lighthouse is 8.6km. Angle BAC is 58 degrees. Determine the distance between B ...
Thursday, February 14, 2013 at 2:16pm

Trig
A Ferris wheel is 40 meters in diameter and boarded from a platform that is 4 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 2 minutes. How many minutes of the ride are ...
Wednesday, February 13, 2013 at 8:30pm

MATHS
Find the lengths of the missing sides in the triangle. Write your answers as integers or as decimals rounded to the nearest tenth. The diagram is not drawn to scale. triangle has sides 7, Y and X and 45 degree angle can someone show me how to do this? im supposed to use trig ...
Wednesday, February 13, 2013 at 9:40am

trig
Given the function y = 3cos(3x + pi), identify: Amplitude (if applicable, give the answer in fractional form) Period (in radians as a multiple of pi - note: do not write "rad" or "radians" in your answer) Phase Shift (if the shift is right, enter + and if ...
Wednesday, February 13, 2013 at 12:51am

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