$53\cdot5$

$\left(3-2y^2\right)^2$

$\left(xy+zx\right)\left(xz-yz\right)$

$2u^2+u=0$

$5a^2b^2-35a^2b^2+55abc$

$\lim_{x\to0}\left(\frac{1+\tan\left(x\right)}{1-\tan\left(x\right)}\right)^{\left(\frac{1}{\sin\left(x\right)}\right)}$

$\frac{dy}{dx}=2x^2+3x^2y+6xy+4x+3y+2$