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September 17, 2014

September 17, 2014

**Recent Homework Questions About Trigonometry**

Post a New Question | Current Questions

**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*

**Precalculus/Trig 5**

A radio transmission tower is 120 feet tall. How long should a guy wire be if it is to be attached 15 feet from the top and is to make an angle of 26 degrees with the ground? Give your answer to the nearest tenth of a foot
*Monday, January 14, 2013 at 1:43am*

**Precalculus/Trig 5**

A radio transmission tower is 120 feet tall. How long should a guy wire be if it is to be attached 15 feet from the top and is to make an angle of 26 degrees with the ground? Give your answer to the nearest tenth of a foot
*Monday, January 14, 2013 at 1:43am*

**Trigonometry**

How am I suppose to transform the left side of the equation into the right side using trig identities? ): 1) sin^2θ - cos^2θ = 2 sin^2θ - 1
*Thursday, January 10, 2013 at 2:29am*

**trig**

Suppose that the point (x,y) is in the indicated quadrant. Decide whether the given is positive or negative. 25.) II, x/r 26.) III, y/r 27.) IV, x/y
*Wednesday, January 9, 2013 at 5:33pm*

**trig**

Solve sin θ = -0.204 for 90º < θ < 270º. Give your answer to the nearest tenth of a degree. Honestly have no idea how to do this.
*Tuesday, January 8, 2013 at 10:58pm*

**Algebra 2/Trig**

I've done every other single question besides this one. (There was 12). I'm stumped and would really appreciate some help! I have to simplify this: 5/3sqrt(3-4) I am not sure if you have to conjugate the denominator and multiply it with the top and bottom, then ...
*Tuesday, January 8, 2013 at 7:33pm*

**trig**

solve for the value of sine and cosine function of 60 degrees.
*Tuesday, January 8, 2013 at 6:47am*

**trig**

solve for the value of sine and cosine function of 60 degrees.
*Tuesday, January 8, 2013 at 6:43am*

**trig**

use pythagorean theorem to solve for the value of x and y of a 60-60-60 degrees.
*Tuesday, January 8, 2013 at 6:41am*

**trig**

how to solve for the value of sine and cosine function of 0,90,180 and 270 degrees?
*Tuesday, January 8, 2013 at 6:37am*

**trig**

how to graph thr trig function f(x)3x-180)+2 and the parent function?
*Monday, January 7, 2013 at 10:03pm*

**Math (Trig)**

Find the indicated ratios in the triangle. Right triangle with a height of 2.56cm length of 4.65cm and hypotenuse of 5.31cm a. tan A b. cos C c. sin C How do I figure this out?
*Monday, January 7, 2013 at 8:18pm*

**trig**

the mini tent of the clock is 5 cm long.how far is the tip of THE HAND TRAVEL IN 35 MINS.
*Monday, January 7, 2013 at 7:53pm*

**Math Trig**

I have to find the x (bottom length of the triangle) in a right triangle. angle A is 33.9 degrees angle B is 90 degrees and the height of the triangle is 3.3cm What formula do I use to figure out this question?
*Monday, January 7, 2013 at 6:08pm*

**Trig..please help!**

Two forces are pushing an ice shanty along the Ice. One has a magnitude of 330 lb in a direction due east. The other force has a magnitude of 110 lb in a direction 54 degrees east of north. What are the magnitude and direction of the resulant force?
*Sunday, January 6, 2013 at 10:18pm*

**Trig**

Find the other five trigonometric ratios of theta. cos theta=7/20 cos theta=1/5
*Wednesday, January 2, 2013 at 4:21am*

**trig**

Find the Opposite of the right angle where the angle is 61 degrees and the Adjacent is 10 cm.?
*Thursday, December 20, 2012 at 2:28am*

**trig**

2sinxcosx+4sin^2xcos^2x=0 solve for x in radians between [0,2pi) (I mean that it is sine squared x and cosine squared x not sine to the power of 2x or cosine to the power of 2x)
*Wednesday, December 19, 2012 at 4:55pm*

**Math-trig**

A stairway runs up the edge of the pyramid. From bottom to top the stairway is 92 m long. The stairway makes an angle of 70° to the base edge, as shown. A line from the middle of one of the base edges to the top of the pyramid makes an angle of elevation of 52° with ...
*Wednesday, December 19, 2012 at 4:33pm*

**trig**

simplify (1-sec^2(è)/(tan^2(è)
*Wednesday, December 19, 2012 at 12:01am*

**trig/precalc**

An airplane with a ground speed of 750 mph and a bearing of N 40 E encounters a wind of 50 mph with a bearing of S 30 E. Find the bearing and ground speed of the plane.
*Sunday, December 16, 2012 at 5:35pm*

**college trig word problem**

A Ferris wheel has a radius of 25 feet.The wheel is rotating at two revolutions per minute.Find the linear speed, in feet per minute, of a seat on this ferris wheel.
*Saturday, December 15, 2012 at 2:16am*

**trig**

if tan x= 4/3 and pip < x < 3pi/2, and cot y= -5/12 with 3pi/2 < y < 2pi find sin(x-y)
*Thursday, December 13, 2012 at 9:14pm*

**trig**

evaluate the following in exact form, where the angeles alpha and beta satisfy the conditions: sin alpha=4/5 for pi/2 < alpha < pi tan beta=7/24 for pie < beta < 3pi/2 answer choices A. sin(beta+alpha) B. tan(beta-alpha) C. cos(alpha-beta)
*Thursday, December 13, 2012 at 9:09pm*

**Trig**

15^(-x-3)=-17^(-3x) using a log base 10
*Wednesday, December 12, 2012 at 6:36pm*

**precalc h**

sin(theta)/1-cos(theta) + 1-cos(theta)/sin(theta) = 2csc(theta) That question makes absolutely no sense.. could someone help me? or lead me in the direction to figuring it out? and.. (Beside the trig functions is theta) 1+1/cos = tan^2/sec-1
*Sunday, December 9, 2012 at 8:17pm*

**trig**

An airplane flies with a speed of 425 mph and a heading of 63°. If the heading of the wind is 24°and the speed of the wind is 31 mph, what is the heading of the plane and the ground speed? I've done a couple questions like this but still a little fuzzy on setting ...
*Sunday, December 9, 2012 at 11:01am*

**Trig**

cos x cot = csc - sin
*Tuesday, December 4, 2012 at 11:27pm*

**trigonometry**

can i use factoring to simplify this trig identity? the problem is sinx + cotx * cosx i know the answer is cscx and i know how to get it but i want to know if i can do factoring to get it bc i tried to but it wont give me the answer . this is the step i went through: 1) sinx...
*Monday, December 3, 2012 at 11:52pm*

**trigonometry**

1) Perform the operation and leave the result in trig. form. [3/4(cos pi/3 + i sin pi/3)][4(cos 3pi/4 + i sin 3pi/4)] Thanks
*Monday, December 3, 2012 at 10:28pm*

**Trig**

The height of a rider on a Ferris wheel is given by h(t)=12-10c0s(2pi)(t) meters, where t gives time, in minutes of the ride. a. Find the amplitude, midline, and period of the function h. b. During the first two minutes of the ride, find the times when the rider has a height ...
*Monday, December 3, 2012 at 7:09pm*

**Trig**

A population of animals oscillates annually from a low of 1300 on January 1st to a high of 2200 on July 1st, and back to a low of 1300 on the following January. Assume that the population is well-approximated by a sine or a cosine function. a. Find a formula for the population...
*Monday, December 3, 2012 at 7:06pm*

**trig**

A 600,000-cell bacteria culture is needed for a lab experiment, but you only could purchase 1,000 cells. If the cells double each day, exactly how long will it be before the experiment can be run? Create a model for the bacteria. If the experiment is in seven days, how many ...
*Monday, December 3, 2012 at 12:51pm*

**trig**

A tree on a hillside casts a shadow c ft down the hill. If the angle of inclination of the hillside is b to the horizontal and the angle of elevation of the sun is a, find the height of the tree. Assume a = 48°, b = 18° c = 235 ft. (Round your answer to the nearest ...
*Thursday, November 29, 2012 at 1:05pm*

**precalc/trig**

olve for the interval [0, 2pi]. cos(x+ pi/4)+cos(x- pi/4)=1
*Thursday, November 29, 2012 at 1:25am*

**trig**

A plane has an airspeed of 200 miles per hour and a heading of 28.0°. The ground speed of the plane is 207 miles per hour, and its true course is in the direction of 38.0°. Find the speed and direction of the air currents, assuming they are constants. (Round your ...
*Thursday, November 29, 2012 at 12:24am*

**trig**

angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 31°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two ...
*Wednesday, November 28, 2012 at 11:43pm*

**trig**

given that 0 is less then or equal to theta and theta is less then or equal to pi. ans cos theta = 2/squar root of 7. Find sin theta
*Wednesday, November 28, 2012 at 2:21pm*

**Pre-Cal Trig**

Two lookout towers are situated on mountain tops A and B, 4 mi from each other. A helicopter firefighting team is located in a valley at point C, 3 mi from A and 2 mi from B. Using the line between A and B as a reference, a lookout spots a fire at an angle of α = 37° ...
*Wednesday, November 28, 2012 at 12:20pm*

**Trigonometry **

How do you solve this trig identity? Using @ as theta: Sin@-1/sin@+1 = -cos@/(sin@+1)^2 I've tried it multiple times but I can't seem to arrive at the answer.
*Tuesday, November 27, 2012 at 11:41pm*

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y
*Tuesday, November 27, 2012 at 11:26pm*

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