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

$\lim_{n\to\infty}\left(\frac{-n\cdot e^{-\frac{s}{n}}}{s}+\frac{n}{s}\right)$

$\int\sqrt{5-4x+4x^2}\:dx$

$\frac{1}{25}+\frac{x^4}{36}-\frac{x^2}{3}$

$\frac{12x^2-9x+4}{2x^2+3x-2}$

$y=\frac{1}{4}x^2+\frac{1}{4}z^2-x-z+\frac{17}{4}$

$441x=3,509$