# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**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 by Kiki*

**trig**

16cos(x)-3sec(x)=0 Find all solutions for x in [0, 2pi)

*Wednesday, April 23, 2014 by Anonymous*

**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 by yyayaa*

**TRIG**

Half angles in trig (square root(1-square root(21)/5)/2)

*Tuesday, April 22, 2014 by Renee ( PLEASE HELP ME)*

**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 by Annabelle*

**Inverse Trig**

What is the general solution to y = arcsin 0?

*Monday, April 21, 2014 by Annabelle*

**Inverse Trig**

How do I simplify arcsin (sin 6 pi) given the interval 0 ≤ theta < 2pi

*Monday, April 21, 2014 by Annabelle*

**Inverse Trig**

What is the general solution to y = arcsin 1?

*Monday, April 21, 2014 by Annabelle*

**Trig Maths**

solve the equation 5sin(θ -pi/6)=8cosθ for values of 0<=θ <=2pi

*Sunday, April 20, 2014 by bon*

**Trig Maths**

solve the equation 5sin(θ -pi/6)=8cosθ for values of 0<=θ <=2pi

*Sunday, April 20, 2014 by bon*

**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 by Anonymous*

**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 by Anonymous*

**Trig**

how do you find the standard form of 7(cos255degrees + isin255degrees) ?

*Tuesday, April 15, 2014 by Anonymous*

**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 by Anonymous*

**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 by Beth*

**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 by Jeff*

**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 by Erika*

**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 by Lisa*

**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 by Lola*

**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 by John*

**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 by John*

**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 by John*

**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 by John*

**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 by kiki*

**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 by Marlo*

**trig**

Use standard identities to express sin(2θ+π/3) in terms of sinθ and cosθ

*Thursday, April 10, 2014 by Pam*

**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 by baylee*

**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 by Danielle*

**trig**

cscx+1/cscx cosx = secx+tanx

*Tuesday, April 8, 2014 by effraim*

**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 by tshepo*

**MathS 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 by OwamIII*

**Math - Int Trig**

Given the functions: f(x)=2x+2 g(x)=3/x^2+2 h(x)=sqrt(x-2) Find the following 1) (f∘g)(-5) 2) (h∘g)(3) 3) (g∘h)(-2) 4) (g∘g)(-2) 5) (f∘h)(12) Find the following and state the domain: 6) h∘g 7) f∘g 8) g∘f 9) g∘g 10)g∘h

*Thursday, April 3, 2014 by Lilly*

**trig**

Help! Ships A and B leave port at the same time and sail on straight paths making an angle of 60 degrees with each other. HOw far apart are the ships at the end of 1 hour if the speed of ship A is 25 km/h and that of ship B is 15 km/h?

*Wednesday, April 2, 2014 by Anonymous*

**trig**

a hot air balloon climbs continuously along a 30° angle to a height of 5,000 feet. To the nearest tenth of a foot, how far has the balloon traveled to reach 5,000 feet? Draw a sketch and then solve.

*Tuesday, April 1, 2014 by Alex*

**trig**

The ferris wheel in an amusement park. It has a diameter of 24m, and it takes 40s to make one complete revolution. If Peter gets on a gondola which is vertically below the centre of the ferris wheel, find his rise in the height after 5s.

*Monday, March 31, 2014 by Yuika*

**Trig**

If 0 ≤ x ≤ 2π, which equation is a line of symmetry for the graph of y = cos x? x = 0 x = 2π x = π y = 0

*Sunday, March 30, 2014 by Kiki*

**Trig**

On the same set of axes, sketch and label the graphs of the equations y = cos 2x and y = –2 sin x in the interval 0 ≤ x ≤ 2π. How many values of x in the interval 0 ≤ x ≤ 2π satisfy the equation –2 sin x – cos 2x = 3? A.1 B.2 C.3 D.4 E.0

*Sunday, March 30, 2014 by Kiki*

**Trig**

In ΔABC, a = 19, c = 10, and m∠A = 111. Which statement can be used to find the value of C?

*Saturday, March 29, 2014 by Kiki*

**Trig**

What is the total number of solutions for the equation 3 tan^2 A + tan A – 2 = 0 in the interval. 0 ≤ A ≤ π?

*Saturday, March 29, 2014 by Kiki*

**Trig**

If the period of a cosine function is 1/3 what is the frequency of the function?

*Saturday, March 29, 2014 by Kiki*

**trig**

A plane is flying due south at a speed of 192 mph. a wind is blowing in at 53 degrees at 13 mph. what is the bearing of the plane?

*Thursday, March 27, 2014 by brittany*

**Trig Identities**

Explain why Sin of theta= -The square root of 1-cos^2 theta is not an identity, using either graphical or numerical reasoning.

*Tuesday, March 25, 2014 by Madison*

**trig**

tan^2(5x)cos^4(5x) = 1/8 - 1/8cos(20x)

*Monday, March 24, 2014 by Peggy*

**trig**

tan^2(5x)cos^4(tx = 1/8 - 1/8cos(20x)

*Monday, March 24, 2014 by Peggy*

**trig**

Find csc(theta), tan (theta), and cos (theta), where theta is the angle shown in the figure. Give exact values, not decimal approximations c=10 b=7 a=7.14 the right angle is locate between sides a and b and the theta angle is an acutle angle sides b and c. i have sin theta as ...

*Monday, March 24, 2014 by Joey*

**Trig - sum and difference formulas**

Write the expression as a single trigonometric functions: cos 6x cosx - sin6x sin x if you could do it step by step? also... How do I prove that sin(90deg + theta) = cos(theta)?? also step by step so i may learn?

*Monday, March 24, 2014 by Anonymous*

**Trig**

The number of values in the interval –π ≤ x ≤ π that satisfy the equation sin x = 2 cos x is 1 2 3 4 0

*Sunday, March 23, 2014 by Kiki*

**trig**

Suppose that Magnus' blood pressure can be modeled by the following function {{{p(t)=83-18sin(71pi*t)}}} Magnus' blood pressure increases each time his heart beats, and it decreases as his heart rests in between beats. In this equation, p(t)is the blood pressure in mmHg (...

*Sunday, March 23, 2014 by joey*

**trig**

cos/sin use 2npi and tan uses npi, but how do you know when to add 2npi or npi to the solution of the equation?

*Wednesday, March 19, 2014 by Anonymous*

**math trig**

a triangle has a measured of hypoteneuos 15 and an adjacent of 10 solve for the triangle.

*Wednesday, March 19, 2014 by mier*

**math trig**

verify the identities COSX OVER 1PLUS SINX PLUS 1PLUS SINX OVER COSX IS EQUAL TO 2SEC.

*Wednesday, March 19, 2014 by mier*

**math trig**

a triangle abc has a mearsure of an adjacent 15 and 25 degree solve for the triangle

*Wednesday, March 19, 2014 by mier*

**trig**

Find all angles, 0≤A<360, that satisfy the equation below, to the nearest 10th of a degree. 2tanA+6=tanA+3

*Sunday, March 16, 2014 by Anonymous*

**Math ( trig )**

If a person on the Ferris wheel is 45 feet above the ground. The Gris wheel has a radius of 47.f and is 5 feet above the ground. At what degrees had the Ferris wheel rotated counted clockwise?

*Wednesday, March 12, 2014 by Gabby*

**trig**

a kite is flying at an angle of elevation of about 40 degrees. all 80 meters of string have been let out. ignoring the sag in the string, find the height of the kite to the nearest 10 meter

*Sunday, March 9, 2014 by Hannah*

**math trig**

A TOWER AND A MONUMENT STAND ON A LEVEL PLANE.THE ANGLES OF DEPRESSION OF THE TOP AND BOTTOM OF THE MONUMENT VIEWED FROM THE TOP OF THE TOWER ARE 13DEGREE AND 31 DEGREE,RESPECTIVELY;THE HEIGHT OF THE TOWER IS 145 FT. FIND THE HEIGHT OF THE MONUMENT.

*Sunday, March 9, 2014 by mier*

**math trig**

two points A and Bare 80 feetapart on the same side of A towerand on a horizontal line through its foot.if angle of elevation of the top of the tower at A is 21 degree and B is 46 degree find the height of the tower.

*Sunday, March 9, 2014 by mier*

**trig**

three forces

*Sunday, March 9, 2014 by Anonymous*

**Trig**

A guy wire attached to the top of an electric pole makes a 70deg angle with the level ground. At a point 25 feet from the guy wire (farther away from the pole), the angel of elevation to the top of the pole is 42deg. How long is the guy wire?

*Friday, March 7, 2014 by Ashley Kate*

**Trig**

Given ∆ABC. If side a is twice as long as side b, is <A necessarily twice as large as <B? Why?

*Thursday, March 6, 2014 by Ashley Kate*

**Trig**

A guy wire attached to the top of an electric pole makes a 700 angle with the level ground. At a point 25 feet from the guy wire (farther away from the pole), the angel of elevation to the top of the pole is 420. How long is the guy wire?

*Thursday, March 6, 2014 by Ashley Kate*

**trig**

city a is 300 miles directly north of city b assuming the earth to be a sphere of radius 4000 miles determine the difference in latitude of the two cities make answers accurate to the nearest second

*Wednesday, March 5, 2014 by Anonymous*

**Trig**

A weather balloon is sighted between points A and B which are 5 miles apart on level ground. The angle of elevation of the balloon from A is 37 degrees and it's angle of elevation from B is 58 degrees. Find the height, in feet, of the balloon above the ground.

*Wednesday, March 5, 2014 by Nairb*

**Trig**

How do you solve this problem? y = 2sin 3x + 4sin 2x I haven't done these types of problems for awhile and have forgotten how to do them.

*Wednesday, March 5, 2014 by Mary*

**Geometry/Trig**

A plane is flying and show an air speed of 130 mi/h. However, there is a 20 mi/hr crosswind. What is the resulting speed of the plane.

*Monday, March 3, 2014 by Anna*

**Trig**

given that sinx=3/4 and cosy=-5/13 and both x and y are in quadrant II, find the exact value of cos(x-y)

*Sunday, March 2, 2014 by Blaire*

**Trig**

Prove the following: 1/(tanØ - secØ ) + 1/(tanØ + secØ) = -2tanØ (1 - sinØ)/(1 + sinØ) = sec^2Ø - 2secØtanØ + tan^2Ø

*Friday, February 28, 2014 by McKenna Louise*

**Trig**

Verify the given equations: ____1______ + ____1_______ = -2 tanθ tanθ – secθ tanθ + secθ 1 – sinθ = sec2θ – 2 secθ tan θ + tan2θ 1 + sinθ

*Friday, February 28, 2014 by McKenna Louise*

**trig**

From the foot of a building i have to look upwards at an angle of 22 degrees to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50 degrees to look at the top of the tree. A) How tall is the ...

*Thursday, February 27, 2014 by Jiskha*

**Alg/Trig**

The angle of elevation from a point on the ground to the top of a tree is 39.8 degrees. The angle of elevation from a point 51.7 ft farther back to the top of the tree is 19.7 degrees. Help find the height of the tree.

*Wednesday, February 26, 2014 by Anonymous*

**trig**

a sailor on a boat 580 metres from the base of a vertical cliff sights the top of a lighthouse with an angel of elevation of 31 degrees

*Wednesday, February 26, 2014 by brooke*

**trig**

an=(-1)n+1/2n

*Tuesday, February 25, 2014 by marvin*

**trig**

Use a calculator to find: θ if θ = csc-1 1.7516. θ = _____°. Round to three decimal places.

*Sunday, February 23, 2014 by skye*

**math12A TRIG pleas help**

a farmer wishes to fence a field in the form of a right triangle.If one angle of the right triangle is 43.2 degree and the hypotenuse is 200yard,find the amount of fencing needed.

*Thursday, February 20, 2014 by Anonymous*

**Trig**

A plane is 48 miles west and 49 miles north of an airport. The pilot wants to fly directly to the airport. What bearing should the pilot take? In degrees and minutes

*Wednesday, February 19, 2014 by Anonymous*

**Trig**

A straight road slopes upward 14 degrees from the horizontal. A vertical telephone pole beside the road casts a shadow of 60 feet down the road. if the angle of elevation of the sun is 55 degrees, what is the height of the telephone pole?

*Monday, February 17, 2014 by Keserie*

**Trig**

If f(x)=cos^2x and g(x)=sin^2x, what is (f+g)(pi/15)

*Saturday, February 15, 2014 by Cora*

**trig**

If $5000 is invested at a rate of 3% interest compounded quarterly, what is the value of the investment in 5 years?

*Wednesday, February 12, 2014 by Mike*

**trig**

Given csc theta= 4, cot theta < 0 Find the exact values of cos theta and tan theta

*Tuesday, February 11, 2014 by J*

**math - trig**

Why cant we solve an oblique triangle with the Law of Sines if we are given SAS?

*Monday, February 10, 2014 by McKenna Louise*

**trig**

City A is 300kilometer due east of city B. city C is 200kilometer on a bearing of 123degree from city B.how far is it from C to A

*Monday, February 10, 2014 by Israel*

**trig**

a central angle intercepts an arc on a circle equal in length to the diameter of the circle. find the measure, in radians, of the central angle.

*Thursday, February 6, 2014 by Anonymous*

**Math - Trig**

Explain why we cannot solve an oblique triangle with the Law of Sines given SAS.

*Thursday, February 6, 2014 by McKenna Louise*

**Math - Trig**

Use the law of cosines to show that the measure of each angle of an equilateral triangle is 60deg. Explain your reasoning.

*Thursday, February 6, 2014 by McKenna Louise*

**Math - Trig**

What familiar formula can you obtain when you use the third form of the Law of Cosines c^2 = a^2 + b^2 - 2ab cos C and you let C = 90deg? What is the relationship between the Law of Cosines and this formula?

*Thursday, February 6, 2014 by McKenna Louise*

**trig**

An advertising blimps hovers over stadium at the altitude of 152 m.the pilot sites a tennis court at in 80 degree angle of depression. Find the ground distance in the straight line between the stadium and the tennis court. (note: in an exercise like this one, and answers ...

*Thursday, February 6, 2014 by Jasmine*

**trig**

An advertising blimps hovers over stadium at the altitude of 152 m.the pilot sites a tennis court at in 80 degree angle of depression. Find the ground distance in the straight line between the stadium and the tennis court. (note: in an exercise like this one, and answers ...

*Thursday, February 6, 2014 by Jasmine*

**trig**

A kite is flying at an angle of elevation of about 40 degrees. All 80 meters of string have been let out. Ignoring the sag in the string, find the height of the kite nearest ten meters.

*Wednesday, February 5, 2014 by Jasmine*

**trig**

A kite is flying at an angle of elevation of about 40 degrees. All 80 meters of string have been let out. Ignoring the sag in the string, find the height of the kite nearest ten meters.

*Wednesday, February 5, 2014 by Jasmine*

**trig**

Find all the solutions from [0, 2pi] cot^2x+csc=x

*Tuesday, February 4, 2014 by Hank*

**Trig**

A fan makes 3 revolutions per second. The blades are 21 inches long. How do I find the angular velocity of a fan blade? in radians per second

*Monday, February 3, 2014 by Anonymous*

**trig**

Your search for A surveyor is trying to determine the width of a river. He forst stands at point A, directly opposite a tree at point B. He then walks 100 feet to point C. He measures the acute angle at point C to be 79 degrees. What is the width of the river?

*Sunday, February 2, 2014 by Tee*

**Trig**

the sine of an angle is 0.6. the constraint is the angle lies in quadrant II. how do I figure out what x is to solve the six functions?

*Saturday, February 1, 2014 by math*

**trig**

if sin and sec of theta are less than zero what quadrant is it in

*Wednesday, January 29, 2014 by Anonymous*

**trig**

sin 60 ka man

*Tuesday, January 28, 2014 by Anonymous*

**trig**

A person stands at a distance from the tower and eyes the top of the tower at 30 degree angle of elevation. He then walks 425 feet towards the tower and eyes the top of the tower at a 58 degree angle of elevation. The person is 5 feet tall. How tall is the tower?

*Sunday, January 26, 2014 by Lynn*

**trig**

csc^4-cot^4= 1+cos^2/sin^2 i need help! please help me

*Friday, January 24, 2014 by jenny*

**Trig**

Use a graphical method to find a solution to the following system of equations in the interval –1 ≤ x ≤ 5: y = x2 – 4x + 2 y = x + 2 The solution set to this system of equations in the interval –1 ≤ x ≤ 5 is {} {(2, 0)} {(0, 2), (5, 7)} {(2, 0), (...

*Friday, January 24, 2014 by Kiki*

**trig**

A computerized spin balance machine rotates a 35-inch-diameter tire at 400 revolutions per minute. (a) Find the road speed (in miles per hour) at which the tire is being balanced. (Round your answer to two decimal places.) (b) At what rate should the spin balance machine be ...

*Thursday, January 23, 2014 by Jesse*

**Algebra 2/ Trig**

Igor is flying a kite. he has let out 300 feet of kite string. the string makes an angle of 64 degrees with the level ground. To the nearest foot, how high is his kite?

*Tuesday, January 21, 2014 by Breana*