2 Answered Questions for the topic double angle formulas

Double Angle Formulas Precalculus



(cos^2(2x))(sin^2(2x))Write the expression in terms of first powers of cosine. Simplify as much as possible.


Given Cos (2x)= -24/25, 2nd Quadrant (pi/2 <x< pi); What is Sin(x) ?

Am I missing something big here? I've gotten around to making sin(2x)=7/25 but I don't understand how to go from double angle to single angle using identities.

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