Saturday

September 5, 2015
**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*

**Trig**

Suppose you would like to cross a 209-foot wide river in a boat. Assume that the boat can travel 32 mph relative to the water and that the current is flowing west at the rate of 6 mph. If the bearing chosen is chosen so that the boat will land at a point exactly across from ...
*Sunday, November 18, 2012 by Adam*

**trig**

A ship is headed due north at a constant 20 miles per hour. Because of the ocean current, the true course of the ship is 15°. If the currents are a constant 18 miles per hour, in what direction are the currents running? (Enter your answers as a comma-separated list. Round ...
*Friday, November 16, 2012 by janice*

**trig**

A 52-foot wire running from the top of a tent pole to the ground makes an angle of 57° with the ground. If the length of the tent pole is 44 feet, how far is it from the bottom of the tent pole to the point where the wire is fastened to the ground? (The tent pole is not ...
*Friday, November 16, 2012 by janice*

**trig**

Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest whole number. Round your answers for sides c and c' to two decimal places. If either triangle is not possible, enter NONE in each corresponding answer blank...
*Friday, November 16, 2012 by janice*

**trig**

Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest minute. Round your answers for sides a and a' to two decimal places. If either triangle is not possible, enter NONE in each corresponding answer blank.) B...
*Friday, November 16, 2012 by janice*

**trig**

Find all solutions to the following triangle. (Round your answers for angles A, B, A', and B' to the nearest minute. Round your answers for sides a and a' to the nearest whole number. If either triangle is not possible, enter NONE in each corresponding answer blank...
*Friday, November 16, 2012 by janice*

**trig**

Find all solutions to the following triangle. (Round your answers to one decimal place. If either triangle is not possible, enter NONE in each corresponding answer blank.) A = 115.2¡ã, a = 43.6 cm, b = 23.1 cm First triangle (assume B ¡Ü 90¡&...
*Friday, November 16, 2012 by janice*

**trig**

Given BC = 53 cm, BD = 62 cm, CD = 80 cm, ABC = 53°, and ACB = 66°, find the following. (Round your answers to the nearest whole number.) (a) the length of the chainstay, AC AC = cm (b) BCD BCD = °
*Friday, November 16, 2012 by janice*

**trig**

A barge is pulled by two tugboats. The first tugboat is traveling at a speed of 16 knots with heading 135°, and the second tugboat is traveling at a speed of 15 knots with heading 195°. Find the resulting speed and direction of the barge. (Round your answers to the ...
*Friday, November 16, 2012 by janice*

**trig**

A plane has an airspeed of 190 miles per hour and a heading of 24.0°. The ground speed of the plane is 214 miles per hour, and its true course is in the direction of 40.0°. Find the speed and direction of the air currents, assuming they are constants. (Round your ...
*Friday, November 16, 2012 by janice*

**trig**

A plane is flying with an airspeed of 150 miles per hour and heading 155°. The wind currents are running at 25 miles per hour at 160° clockwise from due north. Use vectors to find the true course and ground speed of the plane.
*Friday, November 16, 2012 by janice*

**trig**

A certain species of tree grows an average of 0.5 cm per week. Write an equation for the sequence that represents the weekly height of this tree in centimeters if the measurements begin when the tree is 200 centimeters tall.
*Thursday, November 15, 2012 by Ping*

**trig**

given that 1/2pi<theta<pi and sin theta=1/5, use appropriate trigonometric formulas to find the exact values of the following (i) cos(2theta) (ii) cos theta (iii) sin(2theta)
*Thursday, November 15, 2012 by Sarah*

**Physics**

Calculate the ratio of the kinetic energy to the potential energy of a simple harmonic oscillator when its displacement is 1/8 of its amplitude. (The answer is an integer.) Approach: Choose a specific trigonometric form for the position function x(t). It doesn't matter ...
*Thursday, November 15, 2012 by Alphonse*

**Difficult Trig Word Problem**

The displacement of a spring vibrating in damped harmonic motion is given by y(t) = 4e^-3t sin(2pi*t) where y = displacement and t = time with t greater than/equal to zero. Find the time(s) when the spring is at its equilibrium position (y=0). The number "e" is Euler...
*Wednesday, November 14, 2012 by Greg*

**trig**

Olivia has a pool slide that makes an angle of 25º with the water. The top of the slide stands 4.5 feet above the surface of the water. The slide makes a straight line into the water. How long is the slide?
*Tuesday, November 13, 2012 by Anonymous*

**Trig Identity**

Prove or disprove the following identity sin^4theta - cos^4theta = sin^2theta-cose^2theta
*Tuesday, November 13, 2012 by Jerry*

**trig**

Solve tan2A - 2tanA = -1 for 0º≤A≤360º.
*Monday, November 12, 2012 by trig*

**trig**

cot^2/1 + cot^2 = cos^2
*Monday, November 12, 2012 by TRIG HELP*

**TRIG**

Sinxtanx = sec x
*Monday, November 12, 2012 by TRIG HELP*

**TRIG**

(cotx + cscx(1-cosx)= SIN x
*Monday, November 12, 2012 by TRIG HELP*

**TRIG**

Verify cos x/1+sinx + 1+ sinx/cosx = 2sec
*Monday, November 12, 2012 by TRIG HELP*

**TRIG**

Find one numerical value for cot x/cos x = 5
*Monday, November 12, 2012 by TRIG HELP*

**trig**

(1 + sinx)(secx - tanx) = cos x
*Sunday, November 11, 2012 by mary*

**trig**

tan^2x/1 + tan^2x = sin ^2 x
*Sunday, November 11, 2012 by mary*

**trig**

cos^2 A/ 1+sin A
*Sunday, November 11, 2012 by mary*

**precalc/Trig**

Assume we know the following: cos(22.5 degrees)= sqrt(2+sqrt2)/2 sin(22.5 degrees)=sqrt(2-sqrt2)/2 cos(18 degrees)=sqrt((sqrt5+5)/8) sin(18 degrees)=(sqrt5-1)/4 What is: Sin(82.5 degrees) cos(82.5 degrees) sin(12 degrees) cos(12 degrees)
*Saturday, November 10, 2012 by Anonymous*

**Precalc/Trig**

evaluate the expression assuming that cos(x)=1/7, sin(y)=1/3, sin(u)=2/5 and cos(v)=1/3. what is cos(u+v)? sin(x-y)? and tan(u-v)?
*Saturday, November 10, 2012 by Liz*

**trig**

the pendulum of a grandfather clock is 1.3m long. Determine the length of the arc through which the pendulum moves if it moves through an angle of 15
*Thursday, November 8, 2012 by aj*

**Trig **

Give: a=alpha B=beta csc a= 2 pi/2<a<pi secB=-3 pi/2<B<pi 1)find sin(a+B) 2)find tan(a-B) 3)cos B/2 4)sin a/2
*Wednesday, November 7, 2012 by Sierra *

**trig**

How do you find the exact value of sin 5pi/8?
*Wednesday, November 7, 2012 by Sierra *

**TRIG**

show that cos(pi x) = pi cosx is not an identity by finding a single value of x for which it fails to hold.
*Tuesday, November 6, 2012 by Lynn*

**TRIG**

Given that tanx = 1/sqr(15) and secx -4/sqr(15) find the value of sinx
*Tuesday, November 6, 2012 by Lynn*

**trig**

A tree growing on a hillside casts a 121-foot shadow straight down the hill. Find the height of the tree (in feet) if the slope of the hill is 8 degrees and the angle of elevation of the sun from the horizontal is 50degrees.
*Monday, November 5, 2012 by joey *

**trig**

find the exact value of sinu/2, given that cosu=-4/5 and pi/2less than u less than pi
*Sunday, November 4, 2012 by monica*

**trig**

2 cos(theta-13)= square root of 3
*Friday, November 2, 2012 by john*

**TRIG**

Triangle FGH has vertices F(0, 10), G(10, 0), and HR(1, -1). After rotating triangle FGH counterclockwise about the origin 75º, the coordinates of G' to the nearest hundredth are (2.59, ?).
*Tuesday, October 30, 2012 by karina602*

**TRIG HONORS CH: 5.8**

a ship leaves port with a bearing of S 42deg W after traveling 7 miles, the ship turns 90deg and travels on a bearing of N 52deg W for 10 miles at that time, what is the bearing of the ship to the port?
*Monday, October 29, 2012 by Ashley*

**trig**

a ship leaves port with a bearing of S 42deg W after traveling 7 miles, the ship turns 90deg and travels on a bearing of N 52deg W for 10 miles at that time, what is the bearing of the ship to the port?
*Monday, October 29, 2012 by Selena*

**algebra 2 trig**

8/2+√6
*Monday, October 29, 2012 by Elizabeth*

**trig**

Solve for x please? x/x+3 - 1/x+2 = x/2x+4
*Sunday, October 28, 2012 by Robbie*

**Pre-Cal/Trig**

Explain how to solve the following question. Surveying: From a point A hat is 10 meters above level ground, the angle of elevation of the top of a building is 42 degrees and the angle of depression of the base of the building is 8 degrees. Approximate the height of the building.
*Wednesday, October 24, 2012 by Monica*