Pre-Calc HW Help! TIA?

  • Thread starter Thread starter TurtleLover
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TurtleLover

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I have to prove the identity.

1) cos^3x = (1/2cox)(1 + cos2x)
2) sin^5x = (1/8sinx)(3 - 4cos2x + cos4x)

I have to find the solution

3) sin^2x = cos^2(x/2)

I have to find an exact value using half angle identites.

1) tan 195
2) sin 5?/12
3) cos ?/8
 
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