\int\left(\frac{\cot ^{2} 2 x-1}{2 \cot 2 x}-\cos 8 x \cdot \cot 4 x\r – InterviewSolution

1.	\int\left(\frac{\cot ^{2} 2 x-1}{2 \cot 2 x}-\cos 8 x \cdot \cot 4 x\right) d x
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