`int(sin 2x)/(cos^2x)dx`

Recall that `sin 2x = 2\ sin x\ cos x`

`int(sin 2x)/(cos^2x)dx=int(2\ sin x\ cos x)/(cos^2x)dx`

`=2int(sin x)/(cos x)dx`

`=2int tan\ x\ dx`

`= -2\ ln\ |cos x|+K`

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