$-x-\left(13+4x\right)=-3\left(5-9x\right)+2$

$11a^2b^2+33a^5b^3+44a^2b^4$

$\left(\frac{2x+1}{\left(x-1\right)^3\left(x^2+4\right)^2}\right)$

$y'=\frac{x+y}{x-4y}$

$\left(x+2\right)^2+\frac{1}{2}\left(3+x\right)\ge\left(x-1\right)\left(x+1\right)$

$-2x^2+20x-10$

$\int\frac{x^3}{8\sqrt{\left(x^2+\frac{9}{4}\right)^3}}dx$