Question
Integrate the following with respect to the respective variable: cos 3x cos 2x cos x
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$x = t ^2+ t +1, y =\sin \left(\frac{\pi t}{2}\right)+\cos \left(\frac{\pi t}{2}\right)$ at $t =1$
$\frac{1}{\sin x \cdot \cos x+2 \cos ^2 x}$
$\frac{1}{x\left(x^5+1\right)}$