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December 20, 2014

December 20, 2014

**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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