∫1/(sin^2xcos^2x)
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∫1/(sin^2xcos^2x)
∫1/(sin^2xcos^2x)
∫1/(sin^2xcos^2x)
∫ 1/(sin²xcos²x) dx
=∫ 4/(4sin²xcos²x) dx
=4∫ 1/sin²2x dx
=2∫ csc²2x d(2x)
=-2cot2x + C
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