$\left(3xy+2a\right)^2$

$\frac{12m^5+42m^4+6m^2+21m}{6m^4+3m}$

$\left(4x+15\right)\left(4x+5\right)$

$\left(y+3z\right)\cdot\left(y-3z\right)$

$\int\left(\left(x+1\right)^2\right)^{-\frac{2}{3}}dx$

$4a^2+2a-6a^2+15a$

$\frac{dy}{dx}=\frac{\left(1+e^{-y}\right)\cdot sin\left(x\right)}{1+cos\left(x\right)}$