$\frac{1}{\cos\left(x\right)}+\cos\left(x\right)$

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

$\left(6\sqrt{3}\right)^2$

$\log\left(5\right)^{\sqrt[3]{x^{2+1}}}$

$\frac{d}{dx}\frac{3}{5x^3}$

$\frac{2x}{x+3}-\frac{x}{x-3}=\frac{5x+2}{x+3}$

$\left(u-2\right)\left(u+1\right)$