$\lim_{x\to\infty}\left(\frac{3x^2-2x+5}{x^2}\right)$

$\frac{d}{dx}\left(\ln\left(x\right)+e^{-\frac{y}{x}}=2\right)$

$\frac{z}{5}^2$

$\sec^4\left(x\right)-2\sec^2\left(x\right)\cdot\tan^2\left(x\right)+\tan^4\left(x\right)$

$\frac{d}{dx}.004x^3-.061x^2+.299x+.899$

$\frac{1}{2}\left(x+\frac{1}{3}\right)=\frac{5}{3}$

$4x^2+12x=18$