Friday

February 27, 2015

February 27, 2015

**Recent Homework Questions About Trigonometry**

Post a New Question | Current Questions

**trig**

how do you find algebraically the measure of the obtuse angle, to the nearest degree, that satisfies the equation 3 sec theta = 5 is it sec theta = 5/3 and then cos -1 (5/8) = 0.4
*Wednesday, June 11, 2014 at 8:17pm*

**trig**

Hi there! I NEED SERIOUS HELP, PLEASE!!! i have such a hard time with verifying identities! The question is: [(sin(theta/2)) / csc(theta/2)] + [(cos (theta/2) / sec(theta/2)] = 1 I have a few ideas on how to solve this, but am mainly not sure how to get rid of (theta/2). I am ...
*Wednesday, June 11, 2014 at 5:14pm*

**trig**

A weight attached to a long spring is bouncing up and down. As it bounces, its distance from the floor varies periodically with time. You start a stopwatch. When the stopwatch reads 0.3 seconds, the weight reaches its first high point 65 cm above the ground. The next low point...
*Monday, June 9, 2014 at 12:16am*

**trig**

Establish the following identity: CosA/1-TanA + SinA/1-CotA = CosA-SinA
*Friday, June 6, 2014 at 9:30am*

**trig**

Given that cos A = 5/13 and A and B are both acute angles, calculate the value of Sin2A and Cos2A
*Friday, June 6, 2014 at 9:26am*

**trig**

A car drives 1000 feet on a road that is 8 degrees to the horizontal, as shown in the figure. The car weighs 3400 lb. Thus gravity acts straight down on the car with a constant force F=-3400j. Find the work done by the car in overcoming gravity?
*Friday, June 6, 2014 at 5:00am*

**trig**

in triangle ABC, a = 2, b = the square root of 3, and m,angle C = 30 degrees. What is the value of c? a= 1 b= 2 c= 2square root of 3 d=square root of 3 over 3
*Thursday, June 5, 2014 at 9:26am*

**Trig**

Find the coterminal angles: one positive one negative angle. 55° and (9(3.14)/5) answer degrees in radians and radians in degrees
*Wednesday, June 4, 2014 at 10:33am*

**trig angle of elevation**

The eyes of a basket ball player are 6 feet above the floor. He is at the free-throw line, which is 15 feet from the center of the basket rim. The center of the rim is 10 feet above the floor Before shooting the player decides to step back a few steps. His angle of elevation ...
*Wednesday, June 4, 2014 at 2:46am*

**Trig**

The problem is: an airplane is flying in the direction 120 degrees with an airspeed of 320 mph, and a 35 mph wind is blowing in the direction 60 degrees. The question ask to find the true course and the ground speed. To solve the problem I have done this: Flying 120sin 320_+...
*Monday, June 2, 2014 at 11:14pm*

**trig**

To guard against a fall, a ladder should make an angle of 75o or less with the ground. What is the maximum height that a 20-foot ladder can reach safely to the nearest tenth of a foot? in my diagram I set it up using the sin function since I want to find the height so I did (...
*Monday, June 2, 2014 at 9:47pm*

**trig**

Draw the graph of f(x) = tan x and g(x) = 2cos x for 180 _< thetha _< 180 {since its a graph I'm sure how to draw it here}
*Monday, June 2, 2014 at 4:23pm*

**check my set up please, trig**

Sarah holds the end of her kite string 5 feet off the ground. The kite string makes a 43 degree angle of elevation with the horizontal and the kite is 105 ft. off the ground. How long is the kite string to the nearest tenth of a foot? cos43=100/x ?
*Monday, June 2, 2014 at 1:54am*

**help please trig**

According to the Americans With Disabilities Act, a ramp can rise no more than 1 ft for every 12 ft of horizontal distance. To the nearest tenth degree what is the maximum angle that the ramp can form with the ground?
*Friday, May 30, 2014 at 7:40pm*

**trig! check my answe please**

An advertising blimp hovers over a stadium at an altitude of 125 m. The pilot sights a tennis court at an 8o angle of depression. To the nearest meter, find the ground distance in a straight line between the stadium and the tennis court. I set it up 125/tan8, knowing its a ...
*Friday, May 30, 2014 at 1:38pm*

**Trig**

I was wondering, is a sinusoidal function an algebraic model? Or, on the other hand, is there a way to derive an algebraic model from a sinusoidal function?
*Thursday, May 29, 2014 at 11:42pm*

**Trig**

Hi, I would like to ask anyone available a quick question. How would I explain WHY it is that the data/function of average monthly temperatures for a location are a sinusoidal function? I am having trouble phrasing and explaining it, although I am aware that it is in fact ...
*Thursday, May 29, 2014 at 11:31pm*

**Trig**

Charo is 50 feet from the tallest totem pole, located in Alberta Bay, Canada, which has a height of 173 feet. If Charo’s eyes are 5 feet from the ground, find the angle to the nearest degree of elevation for her line of sight to the top of the totem.
*Thursday, May 29, 2014 at 3:24pm*

**trig**

Solve (1+tan square A)(1-sinA)(1+ sinA)
*Wednesday, May 28, 2014 at 5:22pm*

**trig**

At a horizontal distance of 101 meters from the base of a tower, the angle of elevation to the top is 15 degrees. Find the line of sight distance to the nearest meter.
*Wednesday, May 28, 2014 at 3:03pm*

**trig**

earth is 149 600 000 km from the sun. this distance is equal to 1 A.U (astronomical unit). Mars is seen form earth to make an angle of 68degrees with the sun. a) draw a diagram and label b)how far are earth and mars c) do you think the distance between earth and mars are the ...
*Tuesday, May 27, 2014 at 11:30pm*

**trig length**

To secure a 610-meter radio tower against high winds, guy wires are attached to a ring on the tower. The ring is 7 meters from the top. The wires form a 69o angle with the ground. To the nearest hundredth meter find the length of the guy wire
*Tuesday, May 27, 2014 at 9:36pm*

**trig**

A road has a 10% grade (slope). To the nearest degree what is the angle of elevation of the road? should I use sin?
*Tuesday, May 27, 2014 at 7:56pm*

**Trig**

You and a friend are rowing a boat 8.5 KPH heading north. A cross current is moving 3.2 KPH at an angle of 38 degrees north of the west direction. How fast are you actually moving and what direction are you actually heading?
*Tuesday, May 27, 2014 at 7:30pm*

**trig**

A 15 ft. ladder makes a 35o angle with the side of a house. To the nearest tenth of a foot how high up on the house does the ladder come?
*Tuesday, May 27, 2014 at 7:17pm*

**trig**

From a rock ledge the angle of elevation to the topof a treeis 25 degrees. The angle of depression to the bottom of the tree is 10 degrees. Find the heightof the rock ledgeto the nearest tenth and find the height of the tree to the nearest tenth
*Tuesday, May 27, 2014 at 10:20am*

**trig**

A kite string is 65 metres long and makes an angle of 32 degrees with the ground. Calculate the height of the kite above the ground to the nearest metre.
*Sunday, May 25, 2014 at 5:24pm*

**math trig**

a 3.8m ladder rests against a vertical wall and makes an angle of 38 degrees with the wall. how far does the ladder reach up the wall?
*Sunday, May 25, 2014 at 6:58am*

**trig**

Robert is standing on a cliff and looks down at an angle of depression of 62 degrees to look at a boat. The cliff is 76 feet high. How far is the boat from the cliff? Round your answer to two decimal places. The boat is _________ feet from the cliff.
*Saturday, May 24, 2014 at 11:57pm*

**Trig**

What is the common ratio, r, for the sequence represented by the formula an = 3(2)^-n? 1/2 2 3 6 Is it 2?
*Saturday, May 24, 2014 at 1:06am*

**trig**

A loading ramp is 35 feet long and forms an angle measuring 10° with the ground. How high is the top end of the ramp off the ground? Round your answer to the nearest tenth?
*Thursday, May 22, 2014 at 6:40pm*

**Trig help**

What values for theta(0<_theta<_2pi) satisfy the equation? 3sin theta = sin theta-1
*Tuesday, May 20, 2014 at 12:21pm*

**Trig**

A 24-foot ladder is placed against a building. The building is perpendicular to the level ground so that the base of the ladder is 11 feet away from the base of the building. How far up the building, in feet, does the ladder reach? Round to nearest hundredth.
*Monday, May 19, 2014 at 12:53pm*

**Precal/trig**

sina=3/5, pi/2<a<pi evaluate cos2a
*Monday, May 19, 2014 at 12:54am*

**trig**

In right ∆LMN, sin M = 0.759. What is cos N?
*Friday, May 16, 2014 at 10:10am*

**Math - Int Trig**

31) Locate, name, and classify the extrema of the function. Determine intervals which the function is increasing and decreasing f(x) = -x(x^2 - 2) 32) Determine the end behavior of the function f(x) = 2x - x^3
*Friday, May 16, 2014 at 3:42am*

**Math - Int Trig**

Form a polynomial f(x) with real coefficients having the given degree and zeros 21) Degree: 4, zeroes: 2i and -3i 22) Degree: 3, Zeroes i and -10
*Thursday, May 15, 2014 at 9:36pm*

**Math - Int Trig**

Write an equation for the function that is finally graphed after the following transformations are applied to the graph y=|x|. The graph is shifted right 3 units, stretched by a factor of 3, shifted vertically down 2 units, and finally reflected across the x-axis.
*Thursday, May 15, 2014 at 1:07pm*

**Trig 3**

Why does 1 - COS2(Squared) _________________ COS2 = tan2
*Thursday, May 15, 2014 at 9:56am*

**Help me trig.**

solve the equation in the interval [0,2pi) tan (t/2)-sint=0
*Wednesday, May 14, 2014 at 10:54pm*

**Trig**

Find a parametric equation for the ellipse. Make sure that the graph of your parametric equation is a complete ellipse. 3x^2+4y^2=12
*Wednesday, May 14, 2014 at 7:41pm*

**Trig 2**

What is the smallest value for x where y = sin 2x reaches its maximum ...wtf that means.
*Tuesday, May 13, 2014 at 7:41pm*

**Trig help**

1. What is the period of the function? y = 4 cos pi x A. 1 B. 2 C. pi D. 2pi 2. Which represents the reference angle for 2pi/3? A. 2pi/3 B. pi/3 C. pi/4 D. pi/6
*Tuesday, May 13, 2014 at 6:56pm*

**Trig**

If it helps the answer according to this ACT compass sample test questions print out is 6.93. How to solve it is the question ... C is a 90 degree angle. AB is 8 and the hypotenuse. AC is the base .... we don't know it's length. It's on page 14 if you google this...
*Tuesday, May 13, 2014 at 9:31am*

**trig**

A man on a 135 feet cliff perpendicular (at 90 degrees) to the ground looks down at an angle of 16 degrees and sees his friend. How far away is the man from his friend? How far away is the friend from the base of the cliff? Sketch the triangle that matches this scenario with a...
*Monday, May 12, 2014 at 5:55pm*

**MATH: TRIG**

IF X IS AN ANGLE IN THE FIRST QUADRANT AND COSX= 3/5, FIND THE EXACT VALUE OF SIN2X DONT UNDERSTAND, KNOW THAT THE COSX IS ON A 3,4,5 TRIANGLE
*Monday, May 12, 2014 at 3:44pm*

**Trig**

Use trigonometric identities to solve the equation csc^2x -(√3+1)cotx+(√3-1)=0 in the interval [0, 2pi]
*Friday, May 9, 2014 at 6:39am*

**trig**

solve the equation on the interval [0, 2pi]: tan^2 x - 3 tan x + 2 = 0
*Thursday, May 8, 2014 at 10:01pm*

**Trig**

Evaluate tan(a-b). No decimals. Only exact answer. Sin a = -7/25, cot b = -8/15 neither a nor b are in quadrant IV.
*Wednesday, May 7, 2014 at 3:06pm*

**Trig**

Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 3:06pm*

**Trig**

Use the given information to evaluate sin (a+b). Exact answers only. No decimals. Tan a = 4/3, cos b ='-12/13; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 3:05pm*

**Trig**

Evaluate tan(a-b). No decimals. Only exact answer. Sin a = -7/25, cot b = -8/15 neither a nor b are in quadrant IV.
*Wednesday, May 7, 2014 at 12:48pm*

**Trig**

Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 12:46pm*

**Trig**

Use the given information to evaluate sin (a+b). Exact answers only. No decimals. Tan a = 4/3, cos b ='-12/13; neither a nor b are in quadrant III.
*Wednesday, May 7, 2014 at 12:42pm*

**Trig**

Simplify each expression using fundamental identities. 1. Sin theta cot theta 2. 1-sin^2 theta / cos theta
*Wednesday, May 7, 2014 at 12:37pm*

**trig**

a carousel has eight evely spaced seats shaped like animals. During each ride, the carousel makes between 8 and 9 clockwise revolutions. At the end of one ride, the carousel stops so that the lion is in the position where the zebra was when the ride started. through how many ...
*Wednesday, May 7, 2014 at 12:03pm*

**trig**

On an inclined road, which makes an angle of 25 degrees with the horizontal plane, stands a vertical tower. At a point Q, 150 ft from the base of the tower down the road, the angle of elevation to the top of the tower is 65. How high is the tower?
*Tuesday, May 6, 2014 at 11:58pm*

**trig**

Find all points of intersection of the polar curves r= 2 + 4cos theta and r= 6cos theta. Please explain in detail.
*Tuesday, May 6, 2014 at 3:30pm*

**Trig**

Given sin θ = −1/2 and sec θ > 0, find the exact value of tan 2θ. Radical 3 Radical 3/2 Negative radical 3 Negative radical 3/2
*Saturday, May 3, 2014 at 7:29pm*

**Trig**

Given sin x = 5/13 and 0 < x < pi/2 find the value of sin(π − x). 12/13 5/13 -12/13 -5/13
*Saturday, May 3, 2014 at 7:28pm*

**trig**

A soccer ball is placed 12 ft away from a goal post that measures 8ft high. You kick the ball and it hits the crossbar at the top of the goal. What was the angle of elevation of your kick?
*Thursday, May 1, 2014 at 5:08pm*

**Trig. Math**

A circle of radius 2 inscribed in a right triangle. Find the simplest expression possible for the triangle's area as a function of its hypotenuse.
*Thursday, May 1, 2014 at 3:57pm*

**Trig functions**

The average depth of the water in a port on a tidal river is 4m. At low tide, the depth of the water is 2m. One cycle is completed approximately every 12h. a)Find an equation of the depth, d(t)metres, with respect to the average depth, as a function of the time, t hours, after...
*Wednesday, April 30, 2014 at 8:55pm*

**trig**

On a typical day at an ocean port, the water has a maximum depth of 18m at 6:00 am. The minimum depth of 9m occurs 6.8 hours later. Write an equation to describe the relationship between the depth and time.
*Tuesday, April 29, 2014 at 11:25pm*

**Trig**

What is the sum of the arithmetic series where n=50 , t1=9 and t2=331
*Tuesday, April 29, 2014 at 5:01pm*

**Trig**

What is the sum of the arithmetic series where n=100 , t1=7 and t2=205
*Tuesday, April 29, 2014 at 4:59pm*

**Trig **

Find the 20th term of an arithmetic sequence with a=1 and d=1/2
*Tuesday, April 29, 2014 at 4:53pm*

**Trig**

Find the 6th term of the arithmetic sequence with a9=120 and a14=195
*Tuesday, April 29, 2014 at 4:51pm*

**Integrated Trig**

How many years will it take for an initial investment of $5,000 to double if it is invested at a rate of 3% compunded continuously? Compounded annually?
*Monday, April 28, 2014 at 2:16pm*

**Trig**

Write a quadratic equation whose roots are 5 + i radical 2 and 5 – i radical 2 ____ x^2 + _____ x+ ______=0
*Saturday, April 26, 2014 at 4:37pm*

**Trig**

If sec A =5/4 and A is an angle in Quadrant IV, find the value of cos A. A. -4/5 B.4/5 C.-5/4 Is it choice A
*Saturday, April 26, 2014 at 4:32pm*

**trig**

16cos(x)-3sec(x)=0 Find all solutions for x in [0, 2pi)
*Wednesday, April 23, 2014 at 11:56pm*

**trig**

if the balloon is currently floating 60 feet in the air (measure from the bottom of the basket) , what is the approximate angle of depression of the person in the basket?
*Wednesday, April 23, 2014 at 9:27pm*

**TRIG**

Half angles in trig (square root(1-square root(21)/5)/2)
*Tuesday, April 22, 2014 at 10:14pm*

**Inverse Trig**

Using -pi/2 ≤ y ≤ pi/2, what are the following solutions? y=arcsin root3/2 y=arcsin 1/2
*Monday, April 21, 2014 at 5:44pm*

**Inverse Trig**

What is the general solution to y = arcsin 0?
*Monday, April 21, 2014 at 5:41pm*

**Inverse Trig**

How do I simplify arcsin (sin 6 pi) given the interval 0 ≤ theta < 2pi
*Monday, April 21, 2014 at 5:40pm*

**Inverse Trig**

What is the general solution to y = arcsin 1?
*Monday, April 21, 2014 at 5:39pm*

**Trig Maths**

solve the equation 5sin(θ -pi/6)=8cosθ for values of 0<=θ <=2pi
*Sunday, April 20, 2014 at 11:07am*

**Trig Maths**

solve the equation 5sin(θ -pi/6)=8cosθ for values of 0<=θ <=2pi
*Sunday, April 20, 2014 at 11:04am*

**trig**

a 725 pound trailer is sitting on a ramp inclined at 36 degrees. how much force is required to keep the trailer from rolling down the ramp??
*Wednesday, April 16, 2014 at 10:25pm*

**Trig**

Force 1= 65 pounds , Force 2=90 pounds find the angle between the forces? magnitude of the resultant force= 70lbs
*Wednesday, April 16, 2014 at 10:11pm*

**Trig**

how do you find the standard form of 7(cos255degrees + isin255degrees) ?
*Tuesday, April 15, 2014 at 8:08pm*

**Geometry- trig ratio**

An observer (o) spots a plane flying at a 55 degrees angle to his horizontal line of sight. if the plane is flying at an altitude of 21,000 ft, what is the distance (x) from the plane (p) to the observer (o)?
*Tuesday, April 15, 2014 at 7:38pm*

**Trig**

A vertical pole stands on a 20° slope from 50 m down the slope from the pole the angle of elevation of the top of the pole is 35 degrees. How tall is the pole
*Tuesday, April 15, 2014 at 5:40pm*

**Trig**

A vertical tower is on a 12° slope. from a 50 m down the hill, the angle of elevation of the top of the tower is 30°. find the height of the tower
*Tuesday, April 15, 2014 at 4:03pm*

**HELP!**

Next year (sophomore year) I'm taking the following courses: Honors Algebra II/Trig Spanish III Health AP Biology Honors English AP World History Is AP Bio and world history hard? or no it's not just the exam. Please tell me because this is my first year taking AP.
*Monday, April 14, 2014 at 8:00pm*

**trig**

A car is on a driveway that is inclined 12 degrees to the horizontal. A force of 470lb is required to keep the car from rolling down the driveway. a) Find the weight of the car b) Find the force the car exerts against the driveway
*Monday, April 14, 2014 at 3:44pm*

**trig/ vectors**

Points C and D are directly across from each other on opposite banks of a river. A boat travels across the river directly from point c to point d at a speed of 12 mph. If the current of the river has a speed of 4 mph, at what angle, and speed, must the captain head to travel ...
*Sunday, April 13, 2014 at 8:46pm*

**trig**

Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.
*Friday, April 11, 2014 at 10:50am*

**trig**

Given angle x,where 0 <= x <= 360 (degrees) solve for to the nearest degree. a)cos(2x) = 0.6420 b)sin(x + 20) = 0.2045 c)tan(90 - 2x) = 1.6443
*Friday, April 11, 2014 at 10:42am*

**trig**

Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.
*Friday, April 11, 2014 at 10:39am*

**trig**

Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.
*Friday, April 11, 2014 at 10:38am*

**trig**

A and B are positive acute angles. if sin A=4/5 and cos B=8/17 find the value of tan (A-B) is the answer =43/100
*Thursday, April 10, 2014 at 5:26pm*

**trig**

An airplane has air speed of 540 mph and a heading of 50*. The wind is blowing from the north at 27 mph. Find the plane's ground speed and course direction.
*Thursday, April 10, 2014 at 3:57pm*

**trig**

Use standard identities to express sin(2θ+π/3) in terms of sinθ and cosθ
*Thursday, April 10, 2014 at 8:20am*

**trig**

a plane is 50000 ft in the air and 30000 ft from an airport find the angle of depression from the plane to the airport
*Wednesday, April 9, 2014 at 7:02pm*

**algebra 2/trig**

Tina can paint a room in 8 hours, but when she and her friend Emily work together, they can complete the job in 3 hours. How long would it take Emily to paint the room alone?
*Wednesday, April 9, 2014 at 10:34am*

**trig**

cscx+1/cscx cosx = secx+tanx
*Tuesday, April 8, 2014 at 5:06pm*

**maths Pls help trig**

1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0<B<90 , prove that 4cos2B+3sin2B=4 4.Prove ...
*Tuesday, April 8, 2014 at 11:01am*

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