$4x-\frac{2}{5}x-\left(3x-y\right)+\left(\frac{1}{2}x-\frac{1}{5}y-\left(-\frac{1}{6}x-\frac{1}{3}y\right)\right)$

$\int\left(3x+1\right)\cdot cos\left(3x\right)\:dx$

$\sqrt[3]{3x}\cdot\sqrt[3]{9x^2}$

$\left(2x^2+3y\right)^2\left(6x^4-3y^3\right)$

$\int\frac{12}{x^3+4x}dx$

$-3\:\cdot\:5+4\:\cdot\:-2$

$\int\frac{2x}{\left(x^2-9\right)}dx$