$\frac{dy}{dx}=\left(x^2+x\right)\left(y^2+y\right)$

$\frac{2a-6}{a^2+2a}\cdot\frac{3a}{a-3}$

$\left(x+4\right)\left(x-4\right)\left(x^2-4\right)$

$\int x^4\cdot9^x$

$\left(\frac{-x+6x^2}{3x^3+4x}\right)^3$

$\left(-80\right)^0$

$\int\frac{5x^2-4x+6}{\left(x^2+9\right)^3}dx$