$-4xy\left(3y-1\right)\left(y+1\right)$

$\left(19\cdot5-12\cdot4\right)+\left(100-4\cdot30\right)$

$\left(5x^{2}y\right)\left(5x^{2}y\right)$

$\int\left(\frac{1+tan^2x}{sec^2x}\right)dx$

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

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

$\frac{4^{18}}{4^6}$