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March 4, 2015

March 4, 2015

**Recent Homework Questions About Trigonometry**

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**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 at 6:18am*

**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 at 6:17am*

**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 at 10:03pm*

**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 at 2:10pm*

**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 at 2:00am*

**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 at 5:51pm*

**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 at 8:08pm*

**Trig Identity**

Prove or disprove the following identity sin^4theta - cos^4theta = sin^2theta-cose^2theta
*Tuesday, November 13, 2012 at 9:46am*

**trig**

Solve tan2A - 2tanA = -1 for 0º≤A≤360º.
*Monday, November 12, 2012 at 5:16pm*

**trig**

cot^2/1 + cot^2 = cos^2
*Monday, November 12, 2012 at 7:35am*

**TRIG**

Sinxtanx = sec x
*Monday, November 12, 2012 at 7:34am*

**TRIG**

(cotx + cscx(1-cosx)= SIN x
*Monday, November 12, 2012 at 7:33am*

**TRIG**

Verify cos x/1+sinx + 1+ sinx/cosx = 2sec
*Monday, November 12, 2012 at 7:32am*

**TRIG**

Find one numerical value for cot x/cos x = 5
*Monday, November 12, 2012 at 7:31am*

**trig**

(1 + sinx)(secx - tanx) = cos x
*Sunday, November 11, 2012 at 9:52pm*

**trig**

tan^2x/1 + tan^2x = sin ^2 x
*Sunday, November 11, 2012 at 9:52pm*

**trig**

cos^2 A/ 1+sin A
*Sunday, November 11, 2012 at 9:51pm*

**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 at 2:11am*

**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 at 12:48am*

**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 at 9:11pm*

**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 at 11:27am*

**trig**

How do you find the exact value of sin 5pi/8?
*Wednesday, November 7, 2012 at 10:51am*

**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 at 9:32am*

**TRIG**

Given that tanx = 1/sqr(15) and secx -4/sqr(15) find the value of sinx
*Tuesday, November 6, 2012 at 9:30am*

**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 at 10:38pm*

**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 at 9:53pm*

**trig**

2 cos(theta-13)= square root of 3
*Friday, November 2, 2012 at 1:29am*

**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 at 1:53am*

**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 at 10:55pm*

**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 at 10:53pm*

**algebra 2 trig**

8/2+√6
*Monday, October 29, 2012 at 10:55am*

**trig**

Solve for x please? x/x+3 - 1/x+2 = x/2x+4
*Sunday, October 28, 2012 at 6:11pm*

**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 at 8:44pm*

**Trig**

From a point 120 feet from the base of a plant building the angle of elevation to the roof line of the building is 38 degrees. The angle of elevation to the top of an antenna is 43 degrees. The antenna is attached to the nearest edge of the roof and the ground is flat. The ...
*Wednesday, October 24, 2012 at 5:10pm*

**trig**

Use an addition or subtraction formula to simplify the expression: tan(2−u)=cot(f(u)).
*Tuesday, October 23, 2012 at 11:58pm*

**trig**

Show that the height, h, of the A-frame is equal to the expression 5sinc(1+2cosc). Im not sure what to do.
*Monday, October 22, 2012 at 7:08pm*

**Precalc/Trig**

Find the smallest positive number t such that e^sin(t)=1/2
*Saturday, October 20, 2012 at 11:22pm*

**Precalc/Trig**

what angle does the line y=6/7x make on the xy plane with a positive x axis?
*Saturday, October 20, 2012 at 11:04pm*

**Precalc/Trig**

what angle does the line y=6/7x make on the xy plane with a positive x axis?
*Saturday, October 20, 2012 at 11:03pm*

**Math (Trig)**

In 1893, the city of Chicago put on a World's Fair to celebrate the 400th anniversary of Columbus' trip to the Americas. The most spectacular at this fair was a huge Ferris Week built by an engineer named George Ferris. This remarkable structure had a diameter of 250 ...
*Saturday, October 20, 2012 at 3:57pm*

**Trig**

Sin theta=8/17, theta in Quadrant I, Cos X=-sqrt5/5 in Quadrant II
*Friday, October 19, 2012 at 3:25pm*

**trig**

A 15 FOOT LADDER MAKES 52 DEGREES ANGLE WITH THE GROUND.HOW FAR WILL THE TOP OF THE LADDER BE ABOVE THE GROUND?
*Friday, October 19, 2012 at 1:21am*

**Trig**

a person who eyes are 5 feet above the ground observes the top of a building to have an angle of elevation of 40 degree. The person walks 100 feet closer to the building and observes that the top of the building now has an angle of elevation of 65 degree. How high is the ...
*Wednesday, October 17, 2012 at 9:33pm*

**Trig**

A baseball diamond is a square with sides 22.4m The pitchers mound is 16.8m from home plate on the line joining home plate and second base. How far is the pitchers mound from first base?
*Tuesday, October 16, 2012 at 6:14pm*

**trig**

two trains leave Kansas City at the same time. Train A is traveling due north at 55 mph, train B is traveling west at the rate of 65 mph. Find the distance between the two trains two hours later and the bearing of train B from train A.
*Tuesday, October 16, 2012 at 5:51pm*

**Math Trig**

Find the values of the six trigonometric functions of an angle in standard position if the point with coordinates (12, 5) lies on its terminal side? Please explain how!
*Tuesday, October 16, 2012 at 9:56am*

**Math Trig**

Find the values of the six trigonometric functions of an angle in standard position if the point with coordinates (12, 5) lies on its terminal side? Please explain how!
*Tuesday, October 16, 2012 at 9:56am*

**TRIG **

An airplane flying at 550 miles per hour has a bearing of 53°. After flying for 2.5 hours, how far north and how far east will the plane have traveled from its point of departure? I'm having a REALLY hard time with this one. I don't know what I'm doing wrong. ...
*Tuesday, October 16, 2012 at 12:17am*

**TRIG.**

From a point 50 feet in front of a church, the angles of elevation to the base of the steeple and the top of the steeple are 35° and 47° 20', respectively. Find the height of the steeple. I missed class this day and have no idea how to go about this problem. I'...
*Monday, October 15, 2012 at 11:01pm*

**Trig**

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the oppisite side of the runway are 6 degrees and 13 degreess respectivel. The points and the tower are in the same vertical plane and the ...
*Monday, October 15, 2012 at 3:27pm*

**trig**

A plane is flying 12,000 feet horizontally from a tall, vertical cliff. The angle of elevation from the plane to the top of the cliff is 45degrees, while the angle of depression from the plane to a point on the cliff at elevation 8000 feet is 14degrees. Find the height of the ...
*Monday, October 15, 2012 at 3:02am*

**Trig**

Let f and g be two invertible functions such that f^-1(x)=5/x+4 and g(x)=4(x-2). Find f(g(5)). Show your steps please so I can see how to do it. Thank you! :)
*Friday, October 12, 2012 at 1:44am*

**trig**

A survey team is trying to estimate the height of a mountain above a level plain. From one point on the plain, they observe that the angle of elevation to the top of the mountain is 24. From a point 1000 feet closer to the mountain along the plain, they find that the angle of ...
*Wednesday, October 10, 2012 at 7:50pm*

**Precalc/Trig**

Find all values of x, 0<x<(pi/2) for which (1/( root 3))<cotx<(root 3)
*Wednesday, October 10, 2012 at 7:22pm*

**trig**

what is sin x = 1, what is the value of csx
*Wednesday, October 10, 2012 at 4:29pm*

**trig**

what is 7pi/3 in degree .13pi/3 in degree
*Wednesday, October 10, 2012 at 1:44am*

**Trig.**

I'm trouble solving for theta. Any help is appreciated. 0.73377324 = sin(theta)/cos(theta)
*Tuesday, October 9, 2012 at 6:22pm*

**trig**

Find the domain of each function. f(x)=Sqareroot of 5-x f(x)=x^3/x^2-16
*Tuesday, October 9, 2012 at 6:15pm*

**trig**

Find the following values for each function a. f(0) b. f(-1) c. f(-x) d. f(x+1) f(x)=2x^2+3x-4 I you plug in the value for each x, I just want to check my answers. Thanks.
*Tuesday, October 9, 2012 at 6:13pm*

**Trig help?**

are these functions periodic? i - y=abs(sin(x)) = sin(x) ii - y=cos(X^2) iii - y = cos(sin(x)) I am completely lost on these :/
*Tuesday, October 9, 2012 at 12:11pm*

**Trig!**

Find the following values for each function. A. f(0) B. f(-1) C. f(-x) D. f(x+1) f(x)=2x^2+3x-4 and f(x)=x^2/x+1
*Tuesday, October 9, 2012 at 12:31am*

**math**

I need help with this trig problem cotθ=-√3/3 and 3/2π≤θ≤π, find θ
*Monday, October 8, 2012 at 7:46pm*

**Precalc/Trig Word Problem**

From the top of a 200-ft lighthouse, the angle of depression to a ship in the ocean is 23 degrees. How far is the ship from the base of the lighthouse?
*Monday, October 8, 2012 at 9:12am*

**Precalculus/Trig 6**

Find the exact value of the following trigonometric functions: sin(13pi), cos(14pi), tan(15pi)
*Monday, October 8, 2012 at 9:05am*

**Precalculus/Trig 5**

Find the exact value of thet following trigonometric functions: tan(5pi/6) tan(7pi/6) tan(11pi/6)
*Monday, October 8, 2012 at 9:03am*

**Precalculus/Trig 3**

The degree measure of an angle theta is 40 degrees. What is the radian Measure of theta? at what point P does the terminal ray intersect the unit circle (what is the ordered paid P(____, ___)?
*Monday, October 8, 2012 at 9:02am*

**trig**

weather balloon is directly west of two observing stations that are 10 mi apart. The angles of elevation of the balloon from the two stations are 17.6 degrees and 78.2 degrees. How high is the balloon?
*Monday, October 8, 2012 at 8:58am*

**Precalc/Trig 2**

The point P lies in the 4th quadrant and is located on a circle of radius 2. Find the missing coordinate for P. (___, (negative square root of 3)).
*Monday, October 8, 2012 at 8:57am*

**Precalc/Trig 1**

What equation would you use to show that the point ((square root of 11)/(6), (5/6))is on the unit circle?
*Monday, October 8, 2012 at 8:53am*

**trig**

two intersecting sides are 250ft and 170ft, angle between is 55 degrees. use the 250ft side as the base, what is the height of the triangle
*Monday, October 8, 2012 at 8:28am*

**trig**

tan^2theta+6=sec^2theta+5
*Thursday, October 4, 2012 at 2:34am*

**TRIG**

find the degree measure of a central angle subtended by an arc of 8.00cm in a circle with circumference 20.0cm
*Tuesday, October 2, 2012 at 5:22pm*

**trig**

a plane flying 33,000 ft is 130 miles from the airport when it begins to descend if the angle of descent is constant find this angle
*Monday, October 1, 2012 at 8:31pm*

**Math, Trig**

The high level bridge, a railway bridge that crosses the Oldman River is over 1km long. From one point on the river, the angle of elevation of the top of the bridge is 62.6 degrees. From a point 20m closer to the bridge, the angle of elevation of the top of the bridge is 72.8 ...
*Monday, October 1, 2012 at 8:00pm*

**trig**

i have to draw a flat unit circle all the way to 4 pi in radians. i can get to 2 pi but i have trouble finding the radians if i went one more time around the unit circle.
*Friday, September 28, 2012 at 1:04am*

**Math/Trig**

An airplane leaves an airport and flies due west 150 miles and then 170 miles in the direction 210°50'. Assuming the Earth is flat, how far is the plane from the airport at this time (to the nearest mile)
*Thursday, September 27, 2012 at 10:15am*

**Precalc/Trig**

wave is modeled by the function ... h(t) = 3cos(p/10)*t What is the period of the wave (T) *frequency (F) is defined as the number of cycles of the motion per second. What is the relationship between F and T? Find the wave height (H) which is the vertical distance between the ...
*Wednesday, September 26, 2012 at 9:17am*

**Trig**

A ladder is resting against a wall. The ladder and the ground and angle of 40 degrees and the ladder is 4 ft. from the wall. How long is the ladder?
*Tuesday, September 25, 2012 at 1:53pm*

**Trig**

A sprinkler on a golf green is set to spray water over a distance of 20 meters and to rotate through an angle of 160°. Find the area of the region that can be irrigated with the sprinkler. (Round your answer to two decimal places.) I really have no idea how to go about ...
*Monday, September 24, 2012 at 8:23pm*

**Trig**

Two ships leave the same port at 7.am. The first ship sails towards europe on a 54 degree course at a constant rate of 36 mi/h. The second ship,neither a tropical destination, sails on a 144 degree course at a constant speed of 42 mi/h. Find the distance between the ships at ...
*Monday, September 24, 2012 at 7:01pm*

**trig**

A boat is 23 mi due west of lighthouse A. Lighthouse B is 14 mi due north of lighthousenA. Find the bearing of lighthouse B from the boat and the distance from lighthousenB tho the boat.
*Monday, September 24, 2012 at 6:40pm*

**trig**

A boat is 23 mi due west of lighthouse A. Lighthouse B is 14 mi due north of lighthousenA. Find the bearing of lighthouse B from the boat and the distance from lighthousenB tho the boat.
*Monday, September 24, 2012 at 6:32pm*

**Trig**

A cylindrical tank, 6 foot in radius, lies on it's side parallel and against the side of a warehouse. A ladder leans against the building, passes over and just touches the tank, and has a slope of -3/4. Find the equation of the ladder and the length of the ladder
*Sunday, September 23, 2012 at 8:47pm*

**trig**

A woman that is 5'4" stands 15 ft from a streetlight and casts a four-foot long shadow. Determine the height of the streetlight and the degree measure of the angle of elevation form the tip of her shadow to the top of the streetlight, both accurate to two decimal places.
*Sunday, September 23, 2012 at 5:59pm*

**Trig**

A 16 - foot ladder leaning against the side of a house reaches 12 feet up the side of the house. What angle does the ladder make with the ground
*Sunday, September 23, 2012 at 5:02pm*

**TRIG**

A circular power saw has an 8-1/2 inch diameter blade that rotates at 4400 revolutions per minute. a)Find the angular speed of the saw blade in radians per minute. b)Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut. I&#...
*Sunday, September 23, 2012 at 12:26pm*

**math/trig**

A flagpole casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
*Monday, September 17, 2012 at 11:18pm*

**math/trig**

A 16 ft ladder casts a shadow 44 ft with the sun angle of elevation is 60.5 degrees. Find the height of the flagpole and at what angle is the shadow twice as long?
*Monday, September 17, 2012 at 11:16pm*

**trig**

(a) sketch an angle A in standard position whose terminal ray passses through the point (1,-4) (b) Find the exact value of the six trigonometric functions of A, (c) Let B be the reference angle of A. Find a point on the terminal rsy of B in standard position and add B to your ...
*Saturday, September 15, 2012 at 4:47pm*

**trig**

find the reference angle of -20000 and express the six trigonometric functions of -20000 in terms of the six trigonometric functions of its reference angle.
*Saturday, September 15, 2012 at 4:40pm*

**trig**

my question is find all angles of theta and 2pi whose reference angle is alpha = pi/12. Give exact answers. i cannot for the live of me find this
*Saturday, September 15, 2012 at 4:30pm*

**Algebra 2/Trig**

A 5'6" person is standing near a light post that is 18' above the ground. How long is the man's shadow when he is 5' from the base of the light post?
*Tuesday, September 11, 2012 at 8:47pm*

**math trig**

lets say you have a tree or a flagpole. Describe how you would measure this object using right angled triganometry
*Friday, August 31, 2012 at 11:35am*

**trig**

what is the value of sin 70
*Friday, August 31, 2012 at 1:51am*

**trig**

how to prove ; tan 10 degrees + tan 70 degrees - tan 50 degrees = sqrt 3
*Friday, August 31, 2012 at 12:08am*

**trig**

prove that there exists no smallest possitive real number dose there exist a smallest positive rational number given a real number x, does there exist a smallest real y>x?
*Tuesday, August 28, 2012 at 2:40pm*

**Math (Trig/pre-calculus)**

some stars are so far away that their position appear fixed as earth orbits the sun. other stars, however, appear over time to shift their positions relative to the background of "fixed" stars. suppose that the star shown below appears to shift through an arc of ...
*Thursday, August 23, 2012 at 9:52pm*

**trig**

Imagine that you are sitting 6 feet away from a television that is hung on a wall. The top of the TV is 8 feet off the ground. Which function correctly represents the angle that you make with the top of your television?
*Wednesday, August 15, 2012 at 2:34pm*

**trig**

Let be an angle in standard position and the point (a, b) be the point of intersection of the terminal side of with the unit circle. State the unit circle definitions of the six trigonometric functions. cos = sec = sin = csc = tan = cot =
*Monday, August 13, 2012 at 8:53pm*

**trig**

find the exact value of the expression , sin-1(-0.5)
*Monday, August 13, 2012 at 3:58pm*

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