$\left[2x-2\left(x-1\right)\right]5=4-x$

$2a^2+11a-21=0$

$\left(x^2-3\right)^4$

$x2+11+121$

$\lim_{y\to64}\left(\frac{\sqrt{y}-8}{\sqrt[3]{y}-4}\right)$

$\int\frac{8}{x^2\left(x^2-x-2\right)}dx$

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