$S\sin 2x\;log\;\cos x\;dx=$ $$(a)\;\frac{1}{2}\cos^2x-cos^2x log\cos x \qquad (b)\;\frac{1}{2}\cos^2x+\cos^2log\cos x \qquad(c)\;\cos^2x.log\cos x \qquad(d)\;\cos^2x (1-log\cos x)$$

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