# Homework Help: Math: Trigonometry

## Recent Homework Questions About Trigonometry

**trig math**

Prove that tan(theta)tan(60+theta)=tan3theta

*Saturday, December 17, 2011 by Rajesh kumar*

**Trig**

The next two steps in solving this trig identity question are ??? 1/csctheta x costheta x sintheta x sectheta = sinsqtheta arghhh need help please

*Saturday, December 17, 2011 by Don*

**Trig**

Prove the equation is an identity : csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta wow ... try that one

*Saturday, December 17, 2011 by Don*

**Trig**

Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??

*Saturday, December 17, 2011 by Don*

**Trig - Thanks Damon**

Thanks for the help Damon. Much appreciated. Don

*Saturday, December 17, 2011 by Don*

**Trig**

Column 1 Column 2 (sin theta + cos theta)sq 1 + 2sin theta cos theta Question : how do you get column 1 to be the same as column 2?? using the trig identities

*Saturday, December 17, 2011 by Don*

**Trig**

Column 1 Column 2 sec theta - cos theta tan theta sin theta Question: how do you get column 1 to be the same as column 2 ?? using the eight fundamental identities

*Saturday, December 17, 2011 by Don*

**Trig**

Please disregard last question .... wrote it down wrong .. Thanks

*Saturday, December 17, 2011 by Don*

**Trig**

Eight Fundamental Identities Sec thada - Cos thada How do I do this?

*Saturday, December 17, 2011 by Don*

**trig (pre-cal class)**

Suppose è is an acute angle of a right triangle. For this function, find the values of the remaining five trigonometric functions of è. Round to four decimal places. sin è = 0.1 cos è = tan è = cot è = csc è = sec è =

*Thursday, December 15, 2011 by Allison*

**trig**

How do you find 2.8 revolutions per second in radians? I understand that two revolutions would be equal to 4pie but how do you find the 0.8?

*Wednesday, December 14, 2011 by John*

**trig**

A force of 50 pounds acts on an object at an angle of 45°. A second force of 75 pounds acts on the object at an angle of -30°. Find the direction and magnitude of the resultant force.

*Wednesday, December 14, 2011 by Cam*

**trig**

A bolt secured to a bridge is being acted upon by forces being exerted by two cables attached to the bolt. The force vector for one of the cables is represented by F1 = <1.7,9.8>. The other force vector, F2, is known to have a magnitude 5 and a direction angle of 10 ...

*Wednesday, December 14, 2011 by John*

**trig**

SinA =0.5 cosA=?

*Wednesday, December 14, 2011 by Ram*

**trig**

Find ALL solutions to the equation on the interval [0, 2pie]: 2sin(1/2X) = 1

*Wednesday, December 14, 2011 by John*

**trig**

Find the exact values of the inverse function arcsin 1/2

*Tuesday, December 13, 2011 by Nick*

**trig**

A tree casts a shadow 203 feet long. Find the number of feet in the height of the tree knowing that the angle of elevation of the sun is 16 degrees. Give your answer to the nearest integer. a. 57 b. 56 c. 61 d. 58 e. 55

*Tuesday, December 13, 2011 by James B*

**Trig**

The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that is(are) in the interval (0,π/2) is one of following a. {π/6} b. {π/3} c. {π/4} d. {π/3, π/6} e. {π/6, π/4}

*Tuesday, December 13, 2011 by Lenny*

**Trig**

In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A

*Tuesday, December 13, 2011 by Carl*

**Trig**

How do you find cosine, tangent, and cotangent periods?

*Tuesday, December 13, 2011 by Dane*

**Trig**

Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above

*Tuesday, December 13, 2011 by Carl*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

*Tuesday, December 13, 2011 by Rin*

**trig**

By expressing 3x as (2x + x) prove that cos3x = 4cos^3x - 3cosx

*Tuesday, December 13, 2011 by Rin*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. ...

*Tuesday, December 13, 2011 by Joesph*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. M...

*Tuesday, December 13, 2011 by A*

**Math - Trig**

For the equation 4 cos theta - square root 12 = 0, where 0 < theta < (or equal to) 2 pi, determine the measure of theta. The answers to choose from are: A) pi/ 3, 5 pi/ 3 B) 2 pi/ 3, 4 pi/ 3 C) 5 pi/ 6, 7 pi/ 6 D) pi/ 6, 11 pi/ 6 Please explain and show work, because I ...

*Monday, December 12, 2011 by Angi*

**trig**

Find the exact value of the trigonometric function. -cot(pi/4 + 16pi)

*Monday, December 12, 2011 by Keenia*

**trig**

How do you evaluate the expression cos3pi

*Sunday, December 11, 2011 by Freckles*

**trig**

A satellite is in geostationary orbit 22,500 miles above the earth. IF the radius of the earth is 3,960 miles, how fast is the satellite moving in miles per day? How fast is the satellite moving in miles per hour?

*Sunday, December 11, 2011 by shawna*

**Math**

Trying to understand an inverse trig function. Evaluate Cos^-1 (sqr3/2) So I know it's 30 degrees, but wouldn't it also be 150 degrees because the Arc-cos is defined in the 2nd quadrant?

*Sunday, December 11, 2011 by Bobby*

**trig**

Getting ready for trig semester finals. Can't figure out how they are simplifying these equations. (these are the review not actual test) tanx-sqr3=2tanx and 2sin^2+sinx=0

*Sunday, December 11, 2011 by Josh*

**trig**

How do I solve.... Tan 2(theta) - Cos 4(theta) = 0 Domain: (0-360 degrees) Thank you.

*Sunday, December 11, 2011 by Heather*

**Math: Trig**

to determine the height of a pole across a road, Justin takes two measurments. he stands at Point A directly across from the bass of the pole and determines that the angle of elevation to the top of the pole is 15.3 degrees. he then walks 30m parallel to the freeway to point C...

*Sunday, December 11, 2011 by Frany*

**trig**

How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

*Saturday, December 10, 2011 by ALISON*

**trig**

The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller whose aircraft whose engine is expected to run at a maximum of 2800 rpm

*Saturday, December 10, 2011 by bob*

**trig**

If θ is an angle in standard position and its terminal side passes through the point (20,-21), find the exact value of sec(θ).

*Friday, December 9, 2011 by Anonymous*

**trig**

If (cosa-sina)/sina = 2 , then what is tga = ?

*Friday, December 9, 2011 by Evelina*

**trig**

find an expression equivalent to sec theta sin theta cot theta csc theta

*Thursday, December 8, 2011 by Anonymous*

**Math- Trig**

In an oblique triangle ABC, A=30 degree, and the perpendicular from C to AB is 12 inches long. Find the length of AB.

*Thursday, December 8, 2011 by Alisha*

**trig**

Prove that the statement is an identity: (tanx/cscx)=(1/cosx)-cosx

*Wednesday, December 7, 2011 by Ashley*

**trig**

tan theta= -4/3 and sec theta<0 find sin (theta = pi/6)

*Wednesday, December 7, 2011 by Lana*

**Trig**

1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...

*Wednesday, December 7, 2011 by Brittany*

**trig**

simplify: (2sin(2pie/7))/(3cos(3pie/14)

*Wednesday, December 7, 2011 by Aya*

**trig**

I need to prove parallelogram law using the law of cosines. 2AB^2 + 2BC^2 = AC^2 + BD^2 Please, help me to do this.

*Wednesday, December 7, 2011 by Evelina*

**trig**

Cos 3 alpha = - 0.1 solutions in degree

*Wednesday, December 7, 2011 by sherman*

**trig**

a right triangle contains a 25 angle. if me leg is of length 5 inches what is the length of the hypotenuse

*Wednesday, December 7, 2011 by vanessa aquino*

**trig**

CosA*Cos17=1 then determine A

*Wednesday, December 7, 2011 by kunal*

**Trig**

Sec (23π/6)

*Tuesday, December 6, 2011 by Bree*

**Math - Trig please help!**

State two intervals in which the function y=7sin(1/5x)+2 has an average rate of change that is: a) zero b)a negative value c)a positive value Please explain how to get the intervals! Thanks a lot in advance!

*Monday, December 5, 2011 by linda*

**trig**

Find all the solutions of 2 sinx=1-cosx in the interval from 0° ≤x<360°

*Monday, December 5, 2011 by Anonymous*

**trig**

if the terminal ray of an angle 0 in standard position passes through the point (-1,3),then cos0=

*Monday, December 5, 2011 by jason*

**trig**

find all solutions of 2sinx=1-cosx in the interval from 0 to 360

*Monday, December 5, 2011 by Anonymous*

**precalc/trig**

Solve the Logarithmic equation algebraically. Give an Exact Answer and an approximation for x to four decimal places. 20 log(2x+2)=45

*Monday, December 5, 2011 by Alexander*

**precalc**

Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1, where your theta is in degrees. B. The Trig form of z1*z2, where z2=5[cos(60degrees)+isin(60degrees)] C. The Trig Form of (z1)^4

*Monday, December 5, 2011 by Joshua*

**trig**

Find the exact solutions of the equation in the interval [0,2pi). sin(x/2)+cos(x)=0

*Monday, December 5, 2011 by Isaac*

**trig**

We are doing trig identities in school. I need help with these five: 1.1+sinx/1-sinx=cscx+1/cscx-1 2.tanx+sinx/1+cosx=tanx 3.sec^2x/sin^2x=1/sin^2x+1/cos^2x 4.tan^2x/1+tan^2x=1-cos^2x 5.sinx-sin^3x/cos^3x=tanx

*Sunday, December 4, 2011 by Jay*

**trig**

a 30 foot ladder leans against a wall at a 71 degree angle of elevztion find the distance of a ladder's base to the wall

*Saturday, December 3, 2011 by jennifer*

**trig**

Mr. Saurik proposed that the function h(t) = 6sin(3pi(t) - pi/3) + 5, where h(t) is in meters and t is in seconds, models the height above the ground of a point on a spinning wheel. Is Mr. Saurik's equation plausible? Explain.

*Saturday, December 3, 2011 by Alisha*

**precalc/trig**

Write the partial fraction decomposition of the rational expression. 4x^2–19x+31/ (x+2)(x^2–4x+5)

*Saturday, December 3, 2011 by Robert*

**trig**

How to prove the theorem of sines, using S=(a*b/2) * sin γ ?

*Friday, December 2, 2011 by Evelina*

**Math -Trig Please help!**

At one time, Maple Leaf Village (which no longer exists) had North America’s largest Ferris wheel. The Ferris wheel had a diameter of 56 m, and one revolution took 2.5 min to complete. Riders could see Niagara Falls if they were higher than 50 m above the ground. Sketch ...

*Thursday, December 1, 2011 by linda*

**trig**

express the product of radical 90 x radical 40 -radical 8 x radical simplifies to ?

*Thursday, December 1, 2011 by Anonymous*

**trig**

Patients with acute or serious infections, such as Salmonella typhi or gram-negative bacteria causing meningitis, can be successfully treated with regular doses of Chloramphenicol. A patient weighing 150 pounds requires a dose of 850 milligrams, while a patient weighing 300 ...

*Wednesday, November 30, 2011 by brit*

**trig**

for what values of theta between 0 and 2 pi is the function of theta equal sine theta positive?

*Wednesday, November 30, 2011 by matthew*

**trig**

I need to count this: a) 1-tg^2a/1+ctg^2a, when sina =2/3 b) 1-tg^2a/1-ctg^2a, when cosa= -1/3 c) tga * cos^2a, when sina + cosa=5/7 d) tg^2a + 1/sina * 1/cosa + ctg^2a, when tga + ctga =5

*Wednesday, November 30, 2011 by Evelina*

**trig**

I need to prove equality. a) (sina + cosa)^2 -1 / ctga - sinacosa = 2tg^2a b) (sin^2x/sinx-cosx) - (sinx+cosx/tg^2x+1) = sinx + cosx c) sin^4a - sin^2a - cos^4a + cos^2a = cosπ/2 How to do these?

*Wednesday, November 30, 2011 by Evelina*

**trig**

For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x,y). y=7cos(x-pi/6) for x=pi/6, pi/3, 2pi/3, pi, 7pi/6

*Tuesday, November 29, 2011 by katie*

**Math- Trig please help!**

A tire with a diameter of 100 cm rotates 20 times in 3 seconds. a) determine the angular velocity b) how far the tire has travelled? c) what is the speed in km/h?

*Tuesday, November 29, 2011 by linda*

**precalc/trig**

Find the trigonometric form of the number. (Round any angles to two decimal places.) −8 − i

*Tuesday, November 29, 2011 by Alex*

**trig**

Solve the equation for exact solutions over the interval [0, 2pi]. 4 cotx+2=-2

*Tuesday, November 29, 2011 by me*

**trig**

Write cot(t) in terms of sin(t) if the terminal point determined by t is in the first quadrant. Do not leave a fraction inside a radical or use absolute value.

*Monday, November 28, 2011 by Jamie*

**trig**

cos t=.7, tan t<0. find the values of the other 5 trigonometric functions.

*Sunday, November 27, 2011 by Marni*

**trig**

find sin of theta if cos is less than 0 and cot equals 3

*Sunday, November 27, 2011 by Kenzie*

**trig**

Use the Law of Sines to solve each triangle. P=110 degrees p=125, r=200 in triangel PQR

*Saturday, November 26, 2011 by Tyler*

**math/Right triangle trig**

Your favorite team is attempting a field goal. The ball is kicked at an angle of 45 degrees with the field. The ball covers a horizontal distance of 85 inches before the kick is blocked. What is the minimum height the opposing team's player can be to block the kick?

*Tuesday, November 22, 2011 by Anonymous*

**Trig/Math**

RST is a triangle with right angle S. If s- 21.3 Angstroms and t=8.71 Angstroms, find the measure of the larger acute angle.

*Tuesday, November 22, 2011 by Gregory*

**Trig**

Triangle ABC has B= 137degrees, A=31.6 in., and C=42.8 in. Find B.

*Tuesday, November 22, 2011 by Gaius*

**trig**

In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base

*Tuesday, November 22, 2011 by sanatan*

**trig**

In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base

*Tuesday, November 22, 2011 by Anonymous*

**trig**

if tan theta=7/24 and sin theta is greater than 0 what is the exact value of sin theta

*Monday, November 21, 2011 by Anonymous*

**trig**

A and B are acute angles such that cosA =3 over 5 and cosB =12 over 13

*Monday, November 21, 2011 by Michelle*

**trig**

Find the exact value of the trigonometric function given that sin u = − 8/17 and cos v = − 3/5. (Both u and v are in Quadrant III.) cot(v − u)

*Sunday, November 20, 2011 by Alexander*

**Alg. II/Trig**

If m and n are real numbers, i^2=-1, and (m-n)-4i=7+ni, what is the value of m?

*Friday, November 18, 2011 by Lily*

**Trigonometry**

Help trig question involving discriminant? a)Find the value of the discriminant. b)Use any method to find the real roots of the equation if they exist. 2x^2+7x=0

*Thursday, November 17, 2011 by Tomtom*

**trig**

5. If the angles X and Y each measure between 0° and 90°, and if sinX = cosY, what is the sum of the measures of the angles X and Y?

*Thursday, November 17, 2011 by kc*

**algebra/trig help please**

is this graphable??? y=x^2-4x-2

*Wednesday, November 16, 2011 by bunny*

**trig**

-Find sin(x+y), cos(x-y), tan(x+y) and the quadrant of x+y sinx=-3/5, cosy=-7/25, x and y in Q3

*Wednesday, November 16, 2011 by Dana*

**trig**

What is the exact value of 19 pie divided by 12.

*Tuesday, November 15, 2011 by Jimmy*

**Trig**

The path of a projectile fired at an inclination t0 to the horizontal with initial velocity v feet per second is a parabola. The horizontal distance R, in feet, that the projectile travels is given by R = v2sin(2t)/32.2. What is R if v = 152 and t = 74? Give your answer to the...

*Monday, November 14, 2011 by Jared Smith*

**trig**

If sin(t) = -2/48 and cos(t) < 0 what is the value of cos(t) to the nearest thousandth? If sin(t) = -14/34 and cos(t) < 0, what is the value of tan(t) to the nearest thousandth? If tan(t) = -15/19 and sin(t) < 0, what is sin(t) to the nearest thousandth? If tan(t) = ...

*Monday, November 14, 2011 by Jared Smith*

**Trig**

Solve the equation in the given domain cos 4x + cos 2x = 0, 0<(or equal to) x < pi

*Monday, November 14, 2011 by Mark*

**trig**

an isosceles triangle has a perimeter of 60in. the congruent sides measure (2x+9)cm. the length of the third side is 3xcm. what is the value of X?

*Monday, November 14, 2011 by Joey*

**trig**

cosθ =5/13 with -π/2 < θ <0 find each of the following sin( θ - 5π/4) cos( θ - 11π/6) tan( θ + 5π/4) can some1 explain to me how to do these? im completely lost and this is the only thing about my assignment that i cant do can...

*Monday, November 14, 2011 by Yul*

**trig**

find the coordinates of the terminal point on the unit circle determined by t=9pt/7 to two decimal places

*Sunday, November 13, 2011 by Kristin*

**Math/trig**

Solve the equation in the given Domain: 1-cos theta/ sin theta = sqr3, 0degrees <or equal to theta < 369 degrees cos4x + cos 2x =0, 0<or equal to x < pi

*Sunday, November 13, 2011 by Dre*

**Trig**

I have these sum and product property problems and I just want to make sure my work is right. Write equations expressing 1. cos 37degrees cos99degrees as a sum Answer: sin136+(-62) 2. sin4+sin7 as a product Answer: 2sin5.5 sin-1.5 3. cos 8x - cos 2x as a product Answer -...

*Sunday, November 13, 2011 by Kevin*

**trig**

Cos(-11/12) use the sum or difference formula to find the exact number

*Sunday, November 13, 2011 by Lauren*

**Trig**

cos(-11pi/12)

*Sunday, November 13, 2011 by Lauren*

**Algebra/trig**

How would i use my calculator to find the approximate value of the expression, cot 0.2748 rad

*Sunday, November 13, 2011 by Anonymous*

**trig**

Find theta such as tan(theta) = cot(theta+45). Thanks

*Saturday, November 12, 2011 by Mari*