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Which of the following is a step in evaluating.

(Integral) cos^2 5x dx

A. (Integral) 1+cos10x/2 dx
B. (Integral) 1-cos10x/2 dx
C. (Integral) 1+cos10x/20 dx
D. (Integral) 1-cos10x/20 dx

1 answer

I'd say A, since cos10x = 2cos^2 5x - 1

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