$2x\left(5-x\right)$

$8\sin\left(x\right)+8=\frac{4}{\sin\left(x\right)}$

$\left(3m-n^{10}\right)\left(3m-n^{10}\right)$

$\left(3d^{3}+8b^{4}\right)^{2}$

$\left(\sqrt{x}-y^2\right)\left(\sqrt{x}+y^2\right)$

$\frac{x}{2x-6}\ge-1$

$\lim_{x\to\:\infty\:\:}\frac{2^n}{n^2+n}$