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

$\int\frac{3y}{\left(2+3y^2\right)^3}dy$

$\frac{tgx+ctgx}{cscx}=\:senx\:+\:cosx$

$\int\frac{2x^2+2}{x^3+3x}\:dx$

$\lim_{x\to3}\left(\frac{\left|x-4\right|-1}{3-x}\right)$

$\frac{5}{4}x\frac{-4}{9}$

$\int x^2.\ln\cdot\sqrt{1-x}\cdot dx$