Tuesday

December 1, 2015
**trig**

cos^(2) 20 degrees + sin^(2) 20 degrees +pi/2
*Sunday, February 17, 2013 by Anonymous*

**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 by Chris*

**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 by Deepa*

**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 by Danielle*

**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 by Christine*

**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 by Corie*

**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 by kikine*

**Trig/precalc**

Cos[x + (7 Pi)/4] + Cos[x - (7 Pi)/4] = 1
*Tuesday, February 12, 2013 by Joe*

**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 by maranade*

**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 by soul pancake*

**maths (trig)**

how would you work out tan 50=27/x please help
*Monday, February 11, 2013 by random name*

**trig**

what is the exact value of this equation. cos(20) if it equals pi/4
*Sunday, February 10, 2013 by Anonymous*

**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 by Tina*

**math-trig**

tan(t)-sec^2(t)/tan(t)
*Friday, February 8, 2013 by joe*

**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 by Anonymous*

**trig**

1/tan beta +tan beta=sec^2 beta/tan beta
*Monday, February 4, 2013 by saki*

**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 by Vannah*

**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 by gavin*

**trig**

cos(+pi/2-theta)/csctheta+cos^2theta
*Thursday, January 31, 2013 by tina*

**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 by Bob*

**Trigonometry**

What is -6i in standard form? It is originally in trig form.
*Tuesday, January 29, 2013 by Gabby*

**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 by fawn*

**Trig **

How do I prove that tan(x/2) =( plus/minus) sqrt(1-cos(x/1+cos(x))
*Sunday, January 27, 2013 by Sarah*

**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 by Anonymous*

**Trig**

(csc(B)+cot (B))(csc(B)-cot(B))
*Wednesday, January 23, 2013 by VD*

**Trig**

True or false? tan x = tan(x-6pi)
*Wednesday, January 23, 2013 by Jay*

**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 by George*

**trig**

y=2cot2x
*Wednesday, January 23, 2013 by Ginger*

**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 by Joel*

**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 by Ashli*

**alg/trig**

9/x + 9/x-2= 12
*Monday, January 21, 2013 by christina*

**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 by river*

**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 by Mitchel*

**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 by Mitchel*

**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 by Stephanie*

**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 by meep*

**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 by Bruno*

**Trig**

What re the roots of the following polynomial equation (x+5)(x+2)(x-5)=0
*Friday, January 18, 2013 by Anonymous*

**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 by Kelly*

**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 by carl*

**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 by ab*

**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 by Ashley*

**trig proofs**

cotx+tanx=secx+cscx
*Tuesday, January 15, 2013 by katie *

**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 by Deb*

**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 by Knights*

**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 by Lisa*

**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 by Annicka*

**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 by Anonymous*

**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 by Anonymous*

**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 by Anonymous*

**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 by Sira*

**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 by Emili*

**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 by Matt*

**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 by Raelyn*

**trig**

solve for the value of sine and cosine function of 60 degrees.
*Tuesday, January 8, 2013 by au*

**trig**

solve for the value of sine and cosine function of 60 degrees.
*Tuesday, January 8, 2013 by au*

**trig**

use pythagorean theorem to solve for the value of x and y of a 60-60-60 degrees.
*Tuesday, January 8, 2013 by au*

**trig**

how to solve for the value of sine and cosine function of 0,90,180 and 270 degrees?
*Tuesday, January 8, 2013 by au*

**trig**

how to graph thr trig function f(x)3x-180)+2 and the parent function?
*Monday, January 7, 2013 by kim*

**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 by Nj*

**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 by carol*

**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 by nj*

**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 by Rachel*

**Trig**

Find the other five trigonometric ratios of theta. cos theta=7/20 cos theta=1/5
*Wednesday, January 2, 2013 by Lavanda*

**trig**

Find the Opposite of the right angle where the angle is 61 degrees and the Adjacent is 10 cm.?
*Thursday, December 20, 2012 by Joel*

**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 by Emma*

**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 by Anonymous*

**trig**

simplify (1-sec^2(è)/(tan^2(è)
*Wednesday, December 19, 2012 by adsfdsaf*

**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 by Mia*

**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 by Joel*

**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 by liyah*

**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 by liyah*

**Trig**

15^(-x-3)=-17^(-3x) using a log base 10
*Wednesday, December 12, 2012 by Jason *

**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 by sam*

**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 by Chris*

**Trig**

cos x cot = csc - sin
*Tuesday, December 4, 2012 by Alycia*

**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 by v*

**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 by mikey*

**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 by Carrie*

**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 by Alex*

**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 by Amanda*

**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 by Anonymous*

**precalc/trig**

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

**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 by bryan*

**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 by Barb*

**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 by Lilly*

**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 by Kendall*

**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 by Sammy*

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y
*Tuesday, November 27, 2012 by Maddie*

**Math (trigonometry)**

How do you solve this trig identity problem without factoring? I just used @ to represent theta: sin^4@ + 2sin^2@cos^2@ + cos^4@ = 1
*Tuesday, November 27, 2012 by Sammy*

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y
*Tuesday, November 27, 2012 by Maddie*

**trig**

How would I solve this problem for t? 720 = 11.895+2.545sin [2pi/366(t-80.5)]
*Sunday, November 25, 2012 by anna*

**trig**

I don't understand what to do after i convert everything into cos and sin. Verify: cosx(tanx+cotx)=cscx
*Sunday, November 25, 2012 by Sally*

**math**

Simplify sin 2 theta over 2 cos theta to a single primary trig function
*Thursday, November 22, 2012 by rose*

**Physics**

he graph of the velocity of a mass attached to a horizontal spring on a horizontal frictionless surface as a function of time is shown below. The numerical value of V is 5.48 m/s, and the numerical value of t0 is 8.97 s. a) What is the amplitude of the motion in m? b) What is ...
*Tuesday, November 20, 2012 by Jalopy*

**trig**

find all the values of X between 0 and 2π such that cos(3x-π/2) = √3/2
*Tuesday, November 20, 2012 by diego sanchez*

**TRIG HELP**

find the exact solutions over the interval tanx = 1 all real x
*Tuesday, November 20, 2012 by Matt*

**math**

(-3/5, 2) is a point on the terminal side of theta, find the value of the six trig functions
*Monday, November 19, 2012 by Amina*

**trig**

It is 4.7km from Lighthouse A to Port B. The bearing of the port from the lighthouse is N73E. A ship has sailed due west from the port and its bearing from the lighthouse is N31E. How far has the ship sailed from the port?
*Sunday, November 18, 2012 by Ashley*

**Trig**

Suppose you would like to cross a 200-foot wide river in a boat. Assume that the boat can travel 35 mph relative to the water and that the current is flowing west at the rate of 5 mph. What bearing should be chosen so that the boat will land at a point exactly across from its ...
*Sunday, November 18, 2012 by Adam*