$3ax^3-3ay^3$

$\frac{x^3-2x^2+31x+20}{x+5}$

$\left(x^{3}+5x^{2}+3x+16\right):\left(x+5\right)$

$\frac{d}{dx}2^y$

$tg\left(1620+x\right).\cos\left(630-x\right)$

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

$\left(\frac{-5x^{-2}y}{x}\right)^3$