$\left(-5\right)^2-4\left(1\right)\left(2\right)$

$\frac{d}{dx}\cot^24x$

$x^4-33x^2+16$

$\lim_{x\to2}\left(\frac{\sqrt{x+4}-\sqrt{2}}{x+2}\right)$

$\int\:\frac{x^3+2x^2+x-3}{x^4+8x^2+16}dx$

$\frac{x+1}{x-1}-\frac{x-1}{x+2}$

$\int\left(2-5x\right)sen\left(2x\right)dx$