$12x^2-48x+36=0$

$\cos^2\left(x\right)+2\cos^2\left(x\right)+1$

$\frac{d}{dx}\left(x^x\right)\left(x-2\right)^{4x}$

$\lim_{x\to1}\left(\frac{-3}{\sqrt{4x+4}-4}\right)$

$\frac{2x^2+13x+15}{x+5}$

$\int_0^{\infty}\left(\frac{1}{\left(x+3\right)\left(x+5\right)}\right)dx$