$\frac{x^{4}-3^{4}}{x^{2}-3^{2}}$

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

$\int_0^4\left(tan^3x\cdot sec^2x\right)dx$

$\frac{2x^3-4^2-15x+5}{x^2-2x-8}$

$\frac{d}{dx}\:\frac{-2x^4}{\sqrt{4x^3-2}}$

$\int20\sin^3\left(x\right)\cos^2\left(x\right)dx$

$\left(5a^3x+3b^3\right)^2$