$\lim_{x\to4}\left(\frac{\sqrt{x^2-3x}-2}{2\left(x-4\right)^2}\right)$

$\int\frac{\left(cos^{-1}\left(x\right)\right)^{-3}}{\sqrt{1-x^2}}\:dx$

$-9<x-4$

$\frac{\left(2x^4-x^3+x^2+x-1\right)}{x+1}$

$4x^2-3x+1=0$

$\int_1^n\left(\left(3-\left(-1+1\cdot\frac{3}{n}\right)\right)\left(\frac{3}{n}\right)\right)dx$

$\lim_{x\to0}\left(\cos\left(x\right)\right)^{\frac{-1}{x^2}}$