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# Sin and Cos

Pro Problems > Math > Algebra > Functions > Trigonometry > Equations

## Sin and Cos

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

-2(sin2 x)(cos x) + cos2 x = 1

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Problem by Mr. Twitchell

## Solution

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## Similar Problems

### Simple Trig Equation

If (sin2X)(cosX) =
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cosX, and 0 ≤ X < 180, find all possible values of X.

### Fourth Degree Trig

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

8cos4x - 10cos2x + 3 = 0

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