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July 22, 2014

July 22, 2014

**Recent Homework Questions About Trigonometry**

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**Advanced Functions/Trig**

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**

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*

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