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December 20, 2014

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

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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
True or False: For a one-to-one function, y = f(x),then x = F^-1(y). Explain your answer. Please help.
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
(sec^2x-1)(csc^2x-1)=1 prove the following identity ive been stuck on this for hours please help
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

Trig/precalc
Cos[x + (7 Pi)/4] + Cos[x - (7 Pi)/4] = 1
Tuesday, February 12, 2013 at 10:22pm

trig
ABC- with angles AB, and C and sides AB,BC, and AC, angle B is right 90degree angle, if sin of angle A is 0.5, side BC 8in., what is length of AC
Tuesday, February 12, 2013 at 11:01am

trig
As a hot-air balloon rises vertically, its angle of elevation from a point P on level ground d = 140 kilometers from the point Q directly underneath the balloon changes from 15°10' to 29°30' (see the figure). Approximately how far does the balloon rise during ...
Monday, February 11, 2013 at 9:37pm

maths (trig)
how would you work out tan 50=27/x please help
Monday, February 11, 2013 at 1:56am

trig
what is the exact value of this equation. cos(20) if it equals pi/4
Sunday, February 10, 2013 at 8:02pm

trig
Two people decide to estimate the height of a flagpole. One person positions himself due north of the pole and the other person stands due east of the pole. If the two people are the same distance from the pole and a = 30 feet from each other, find the height of the pole if ...
Sunday, February 10, 2013 at 12:23pm

math-trig
tan(t)-sec^2(t)/tan(t)
Friday, February 8, 2013 at 12:51pm

trig
a tower that is a 200 meters is leaning to one side. from a certain point on that side, the angle of elevation to the top of the tower is 70 degree. From a point 55 meters closer to the tower, the angle of elevation is 85 degree. Determine the acute angle from the horizontal ...
Tuesday, February 5, 2013 at 8:33am

trig
1/tan beta +tan beta=sec^2 beta/tan beta
Monday, February 4, 2013 at 4:50pm

trig Elev. & Depress part ii
You are 55ft from a tree. The angle of elevation from your eyes, which are 4.5 ft off the ground,to the top of the tree is 61 degrees. To the nearest foot, how tall is the tree?
Monday, February 4, 2013 at 4:09pm

trig
A mountain road makes an angle θ = 8.4° with the horizontal direction. If the road has a total length of 3.4 km, how much does it climb? That is, find h.
Friday, February 1, 2013 at 1:57pm

trig
cos(+pi/2-theta)/csctheta+cos^2theta
Thursday, January 31, 2013 at 10:49pm

trig
To the nearest degree, all of the following angles are solutions of the equation 2sin x + 4 cos 2x =3 except: (1) 40 degrees (2) 150 degrees (3) 166 degrees (4) 194 degrees
Tuesday, January 29, 2013 at 9:52pm

Trigonometry
What is -6i in standard form? It is originally in trig form.
Tuesday, January 29, 2013 at 12:13pm

math (trig.)
A ferris wheel is 35 meters in diameter and boarded at ground level. The wheel makes one full rotation every 8 minutes, and at time (t=0) you are at the 3 o'clock position and descending. Let f(t) denote your height (in meters) above ground at t minutes. Find a formula for...
Monday, January 28, 2013 at 7:24pm

Trig
How do I prove that tan(x/2) =( plus/minus) sqrt(1-cos(x/1+cos(x))
Sunday, January 27, 2013 at 1:28pm

trig
Give that tan tetha is equal to 3/4 find the values of cos tetha,cos tetha-sin theta,sin tetha.
Sunday, January 27, 2013 at 2:08am

Trig
(csc(B)+cot (B))(csc(B)-cot(B))
Wednesday, January 23, 2013 at 9:45pm

Trig
True or false? tan x = tan(x-6pi)
Wednesday, January 23, 2013 at 8:14pm

Trigonometry
Thank you STEVE!!!!! Suppose that Cos (theta) = 1/square root 2 if 0<equal to theta , pi/2 then sin(theta) = tan (theta) = If 3pi/2 less than equal to theta , 2pi then sin(theta) = tan (theta) = I know the trig functions but I feel like I am missing something here. cos (...
Wednesday, January 23, 2013 at 3:08pm

trig
y=2cot2x
Wednesday, January 23, 2013 at 2:20pm

trig
A wheelchair ramp has an angle of inclination of 10 degrees and rises to a height of 3ft. Determine the length of the ramp in feet.
Tuesday, January 22, 2013 at 8:09pm

Trig
Height of an Obelisk Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with, and on the same side of, the obelisk. If they find that the angles of elevation from the ground where they are standing to the top of the obelisk are ...
Tuesday, January 22, 2013 at 4:07pm

alg/trig
9/x + 9/x-2= 12
Monday, January 21, 2013 at 9:00pm

algebra 2 trig HELP TEST TOMMAR
sam and nikki lie 206 km apart. at 8:00 am. sam started driving to nikki's house at 60km/hr. at 10:00 am nikki started driving to sam's house at 82 km/hr. at what time will they be 15 km apart?
Monday, January 21, 2013 at 5:29pm

Trig
Find the point on the terminal side of θ = three pi divided by four that has a y coordinate of 1. Show your work for full credit.
Sunday, January 20, 2013 at 5:17pm

Trig
The point P(3, 4) is on the terminal side of θ. Evaluate tan θ. 3/4 3/5 4/3 4/5
Sunday, January 20, 2013 at 5:17pm

Trig
A 60-foot flagpole stands on top of a building. From a point on the ground the angle of elevation to the top of the pole is 45 degrees and the angle of elevation to the bottom of the pole is 42 degrees. How high is the building?
Saturday, January 19, 2013 at 3:36pm

early trig
A monument stands on level ground. The angle of elevation of the top of the monument, taken at a point 425 feet from the foot of the monument, is 32º. Find the height of the monument to the nearest foot.
Saturday, January 19, 2013 at 3:15pm

Trig
Using this graph: imgur [dot] com/utSgKI9 Find the measures of angles A and G in the drawing (m is parallel to n) if C=4x-18 and F=2x+34
Friday, January 18, 2013 at 7:11pm

Trig
What re the roots of the following polynomial equation (x+5)(x+2)(x-5)=0
Friday, January 18, 2013 at 11:39am

Trig
A 12-foot ladder reaches 9 ft 6 in up a wall. How far up would a 20-foot ladder reach when placed at the same angle? Write the answer in feet with inches.
Thursday, January 17, 2013 at 11:10pm

trig/sig figs
There are 60" in 1', 60' in 1°, and 2π radians in 360°. Convert arc-seconds into radians. KEep 6 significant figures. If someone could help and walk me through this process, it would be soooo appreciated!
Thursday, January 17, 2013 at 9:05pm

trig
Use a table of trigonometric values to find the angle θ in the right triangle in the following problem. Round to the nearest degree, if necessary. cos θ = 0.9659 A = ? H = 20
Wednesday, January 16, 2013 at 4:25pm

Trig!
a) The annual inflation rate is 3.5% per year. If a movie ticket costs $7.50, find a formula for p, the price of the tickets t years from today, assuming that movie tickets keep up with inflation. b) According to your formula, how much will movie tickets cost in 20 years?
Tuesday, January 15, 2013 at 11:01pm

trig proofs
cotx+tanx=secx+cscx
Tuesday, January 15, 2013 at 7:33pm

trig
An aircraft maintains a speed of 500 miles per hour in a southwestern direction. The velocity of the jet stream is constant 50 miles per hour from the west. Find the resultant vector, the speed, and actual direction of the aircraft.
Tuesday, January 15, 2013 at 6:23pm

Proof math problem help? Please help if you can!
Let AB be the diameter of a circle, and let point P be a point on AB. Let CD be a chord parallel to AB. Prove that PA^2 + PB^2 = PC^2 + PD^2 It can be solved using geometry methods (no trig). Anyway, I figured out that PA^2 +PB^2 = 2OP^2 + 2OB^2. However, I cannot find right ...
Tuesday, January 15, 2013 at 6:01pm

Calculus
Use a trig identity to combine two functions into one so you can solve for x. (The solution should be valid for any value of t). 3cos(t) + 3*sqrt(3)*sin(t)=6cos(t-x) I know that 6 cos(t-x) can be 6(cos(t)cosx(x)+sin(t)sin(x)) I dont know where to go from there though.
Tuesday, January 15, 2013 at 2:38pm

trig
Find the maximum and the minimum values of sinx + cosx and the smallest value of x which they have these values
Tuesday, January 15, 2013 at 4:29am

Trig
log base b 64 - log base b 16 = log base 4 16 solve for the variable.. i got to the part as far as: (log 4/log b) = 2 now i m stuck at how i can isolate the b. plz help!
Monday, January 14, 2013 at 8:42pm

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