$\int x\sin\left(\frac{8}{9}\right)dx$

$\int\frac{3x+6}{x\left(x+2\right)^2}dx$

$\int-u^3e^{-\cos\left(n\right)}du$

$\left(2xy^2+4z\right)\left(3xy^2-5z\right)$

$\int\frac{4}{3}t\sqrt{2+3t}dt$

$\tan\left(a\right)\cdot\cot\left(a\right)\cdot\sin^2\left(a\right)$