`intcsc\ 2x\ cot\ 2x\ dx`

Let `u=2x`, then `du=2\ dx`.

`int csc\ 2x\ cot\ 2x\ dx =int csc\ u\ cot\ u(du)/2`

`=1/2int csc\ u\ cot\ u\ du`

`=1/2(-csc\ u)+K`

`=-1/2csc\ u+K`

`=-1/2csc\ 2x+K`

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