Which technique is most efficient to evaluate ∫cos(x)sin2(x)dx\int \frac{\cos(x)}{\sin^2(x)} dx∫sin2(x)cos(x)dx?
Integration by parts
U-substitution with u=sin(x)u=\sin(x)u=sin(x)
Partial fractions
Trigonometric identity sin2(x)=1−cos2(x)\sin^2(x) = 1 - \cos^2(x)sin2(x)=1−cos2(x)