Asked by Andrea
I really need help on this question
Simplify the expression by using a Double-Angle formula or a Half-Angle Formula
cos^2 0/2-sin^2 0/2
Simplify the expression by using a Double-Angle formula or a Half-Angle Formula
cos^2 0/2-sin^2 0/2
Answers
Answered by
Steve
recall that cos 2x = cos^2 x - sin^2 x
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