`int x^2\ cot\ x^3dx`

Let `u=x^3`, then `du=3x^2\ dx`.

`intx^2\ cot\ x^3dx=intcot\ u(du)/3`

`=1/3intcot\ u\ du`

`=1/3ln\ |sin u|+K`

`=1/3ln\ |sin x^3|+K`

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