$\frac{2x-13}{x^2-3x}$

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

$3\cos\left(\pi\right)$

$e=\:\sqrt{\left(3.02\right)^2+\left(1.99\right)^2+\left(5.97\right)^2}$

$cos^2x-3sin^2x+2=0$

$\left(\frac{2}{5\:}ab+\frac{1}{2}a^3\right)^2$

$x=\left(x^2+1\right)\cdot\left(\tan\left(y\right)\right)\cdot y'$