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Asked by Gina

If sin^2X=A what is an algebraic expression in A for cos(2X). I have no idea where to even begin with this!
15 years ago

Answers

Answered by Reiny
You should have come across the identity
cos 2x = 1 - 2sin^2 x
so
cos 2x = 1 - A^2
15 years ago

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