$\frac{a-2b}{\sqrt{\sqrt{a}-\sqrt{2b}}}$

$x^6-x^5+x^2$

$\lim_{x\to\infty}\left(\frac{x-|x|}{2x}\right)$

$\int\sin\left(x\right)\cdot\left(1+\sqrt{\cos\left(x\right)}\right)^2dx$

$\int_0^y\left(\frac{1}{x^2+30}\right)dx$

$\left(2a^2-3b^3\right)^5$

$\frac{-x^3+x^2-2}{-x^3-x+1}$