$\displaystyle 8 cos^2 x$ Rewrite the expression as an equivalent expression that does not contain powers of triogonometric functions greater than 1.
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Originally Posted by purplec16 $\displaystyle 8 cos^2 x$ Rewrite the expression as an equivalent expression that does not contain powers of triogonometric functions greater than 1. power reduction identity ... $\displaystyle \cos^2{x} = \frac{1+\cos(2x)}{2}$ ... it comes from the double angle identity for cosine.
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