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71 Answered Questions for the topic Trigonometry Identities

Trigonometry Identities Trigonometry Trigonometry Functions

06/27/20

find sin theta, given sec theta= 4/3 and tan theta<0

I know that theta must be in the fourth quadrant but I am lost on what identities to use for solving sin theta.
Trigonometry Identities Trigonometry

05/22/20

For triangle ABC, angle A = 26 degrees, a = 7 cm, b = 15 cm. Determine ALL possible values for c. Round your final answer.

Apparently there might be more than one answer
Trigonometry Identities

07/26/18

If Sinθ+sin²θ=1 Prove that cos²θ+Sin⁴θ=1

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Trigonometry Identities

07/10/18

Solve the equation for 0<q<360. Secθ=(2sqrt3)/3

Trig equation and identity 
Trigonometry Identities

06/06/18

cos^2∅tan∅sec∅=sin∅

Prove each trigonometric identities. 
Trigonometry Identities

04/12/18

Verify the following Identity:

tanθcos2θ=(2tanθcos2θ-tanθ/1-tan2θ)
Trigonometry Identities

03/25/18

sin(45+x).sin(45-x)=1/2cos2x

prove that sin(45+x).sin(45-x)=1/2cos2x
Trigonometry Identities

03/22/18

trig exercise of sums and differences identities

If cosα=0.891 and cosβ=0.577 with both angles’ terminal rays in Quadrant-I, find the values of tan(α+β)Your answers should be accurate to 4 decimal places. please help, thanks!
Trigonometry Identities

03/22/18

trig exercise of sums and differences identities

If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)=? cos(α-β)=? Your answers should be accurate to 4 decimal places. please help! thanks !
Trigonometry Identities Trigonometry Pre Calculus

03/02/18

Solve on the interval [0,2pi) 1-cos theta = (2 - sqrt 3)/2

I dont quite remember how to solve this, if anyone could help.
Trigonometry Identities Trigonometry Trig

01/28/18

Need Help Solving cos -105 with sum or difference identity

The question is cos -105. I know how to do the process for it but for some reason my answer doesn't have the right negatives. I am getting:   √2 + (-√6) --------------         4   The actual... more
Trigonometry Identities Trigonometry Trig

01/26/18

Can't Solve -1-√3 * 1-√3 ------- ------ 1+√3 * 1-√3

I am doing sum and difference formulas with sin, cos, and tan. I am doing tan75 with the difference formula.   So tan 120-45   I have all the things found I just don't know how to multiply it... more
Trigonometry Identities Math Math Help

01/13/18

Determine the exact value of cos(Pi/24)???

Determine the exact value of cos(Pi/24)???
Trigonometry Identities Trigonometric Identities

12/29/17

Rewriting trigonometric identities

How do I rewrite (tanθ+secθ)/cosθ in terms of sinθ? (fully simplified)
Trigonometry Identities Trigonometry

11/22/17

Trigonometry question

prove that tan6.tan42.tan66.tan78=1
Trigonometry Identities Trigonometry Math Help

11/15/17

Solve a trig equation

solve the equation for the solutions over the interval [0 degrees, 360 degrees)   6sec2xtanx=12tanx   I am unsure of where to begin.
Trigonometry Identities Trigonometry Math Help

11/15/17

Trig functions

cos(3theta)=-1 solve for exact solutions over the interval [0,360 degrees]   I am having trouble finding a place to start.
Trigonometry Identities Math Calculus

10/19/17

(tanθ+cotθ)^2=sec^2θ csc^2θ

Proving identities
Trigonometry Identities Trigonometry Trigonometric Functions

07/31/17

Find the values of the six trigonometric functions if the conditions provided hold.

cos(2θ) = 1/√2 (1 divided by square root 2)90° ≤ θ ≤ 180°
Trigonometry Identities Trigonometry Trigonometric Functions

07/31/17

Find the exact value algebraically.

Find the exact value algebraically of sin(105°)
Trigonometry Identities

07/23/17

(sinx)/(cosx-sinx)=cotx+1

(sinx)/(cosx-sinx)=cotx+1, find x
Trigonometry Identities

03/30/17

Use the following information to determine sin(2x)? sin (x) = 2/3 and cos (x) is negative

Solve step by step to get the answer
Trigonometry Identities

02/17/17

Using trig Identities, I need to solve this question

sinxcos^4x+cos^6x=
Trigonometry Identities

02/09/17

Express cos^(4)2x in terms of cosine with an exponent of 1?

Hi, this is my first time using this site. So I have been staring at this trigonometric equation for a long while and looking for what it asks for. For what I know, I think I have to use sum of... more
Trigonometry Identities Identities

12/14/16

Trig Identity

Prove sin4x = 4 (sin x-2 sin^3 x)/secx   I can't seem to solve this! Halp!!!
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