If \( \int e^{\sin x} \cdot \frac{x \cos ^{3} x-\sin x}{\cos ^{2} x...

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If \( \int e^{\sin x} \cdot \frac{x \cos ^{3} x-\sin x}{\cos ^{2} x} d x=e^{\sin x} f(x)+C \) such that \( f(0)=-1 \) then value of \( f(4 \pi) \) is
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