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- Dr OctavianLv 69 years agoFavorite Answer
cos^2(a) = (1/2)*(1 + cos(2a)).
therefore cos^2(6θ) = (1/2)*(1 + cos(12θ)).
therefore integral is
(1/2)*(θ + (1/12)*sin(12θ)) = θ/2 + (1/24)*sin(12θ) + C
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