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sin x sin (cos x)...

`sin x sin (cos x)`

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To solve the integral \( I = \int \sin x \sin(\cos x) \, dx \), we can follow these steps: ### Step 1: Substitution Let \( t = \cos x \). Then, the derivative of \( t \) with respect to \( x \) is: \[ \frac{dt}{dx} = -\sin x \implies dt = -\sin x \, dx \implies \sin x \, dx = -dt \] ...
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