# Sin and Cos

Pro Problems > Math > Algebra > Functions > Trigonometry > Equations## Sin and Cos

Solve for x in the interval [0, 2p)

-2(sin^{2} x)(cos x) + cos^{2} x = 1

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Problem by Mr. Twitchell

## Solution

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Click here to assign this problem to your students.## Similar Problems

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If (sincosX, and 0 ≤ X < 180, find all possible values of X.

^{2}X)(cosX) =3

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### Fourth Degree Trig

Find all angle values between zero and 360 inclusive that make the equation true.

8cos^{4}x - 10cos^{2}x + 3 = 0

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