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![\[
\cos ^{2}(u)=\frac{1+\cos (2 u)}{2}
\]
Apply this formula. The result will be an expression in terms of the first powers o](https://media.cheggcdn.com/media/48b/48bbdfbb-74e9-4a37-ad95-e2d78f0c036e/php9jUCHU)
Expert Answer
We are given the trigonometric expression 4(1+2cos?(2x)+cos2(2x)4)Then, we can s