$\frac{x^2y-y}{y+4}$

$0-\left(-28\right)$

$\frac{\cos\left(x\right)^2+\cos\left(x\right)}{\cos\left(x\right)+\sin\left(x\right)}=\cos\left(x\right)$

$\int\:tan^2\left(3x-1\right)dx$

$\left(6x^2-1\right)^2$

$\frac{d^2}{dx^2}\left(x^{\frac{2}{3}}+y^{\frac{2}{3}}=a^{\frac{2}{3}}\right)$

$\int\:\left(\frac{3}{x^2}+\frac{x^3}{5}+2\right)dx$