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int(cos2x)/(sin^2x xxcos^2x)dx...

`int(cos2x)/(sin^2x xxcos^2x)dx`

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`int(cos2x)/(sin^2x xxcos^2x)dx`
=`int(cos^2x-sin^2x)/(sin^2x:cos^2x)dx`
=`int(cosec^2x-sec^2x)dx`
=`-cotx-tanx+C`
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