$\sin x\sin \left( {\cos x} \right)$
$\sin x\sin \left( {\cos x} \right)$
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NCERT & Exemplar
.: Let$I = \int {\sin x\sin \left( {\cos x} \right)dx}$
Put $\cos x = t$ $\Rightarrow$ $- \sin xdx = dt$
$\therefore$ $I = - \int {\sin \,t\,dt} = \cos t + C = \cos \left( {\cos x} \right) + C$
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