$\sqrt{\frac{2x}{9}}$

$\left(8+c\right)^2$

$\lim_{x\to0}\left(\frac{2+x^2+\cos\left(x\right)}{x^{15}}\right)$

$15-4\cdot2+5\cdot2$

$\left(54h^2kl^2-56hlk\right)\left(54h^2kl^2+56hlk\right)$

$\left(x^2-2y^3+2z^4-8\right)-\left(-17+x^2-2y^3+3z^4\right)$

$\frac{\sqrt{x^2-4}\left(x^2+1\right)}{x^2}$