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11-6.
1. Use the fact that cos(2θ) = 2 cos2 θ − 1 to evaluate the following integrals. Homework Help ✎

$=\frac{1}{2}\int_0^{2\pi}\Big(\cos(2\theta)+1\Big)d\theta$

$2\sin^2(\theta)=1-\cos(2\theta)$