What is ∫ (COS & sup3; X / Sin & sup2; x) DX

∫（cos³x/sin²x）dx
=∫ cos & sup2; X / Sin & sup2; xdsinx / / let SiNx = t
=∫1-t^2/t^2dt=∫dt/t^2-∫dt
=-1/t-t+C=-1/sinx-sinx+C

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