$\int\frac{8}{\left(x^3-4x\right)}dx$

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

$\lim_{x\to1}\left(\frac{x-1}{\sqrt[7]{x}-1}\right)$

$\frac{2-x}{4}<\frac{1}{3}$

$\frac{d}{dx}x^2\:y^2+y+x=2$

$4xyz^4\left(-6x^4y^3z^2+2xy^5\right)$

$x^2+x^2-84$