$\int\frac{-3}{\sqrt{x^2-6x+13}}dx$
$18x^3\sqrt{18x^2-36x^6-1+1}$
$\lim_{x\to\infty}\left(\frac{2x+7}{6x^2+6x-5}\right)$
$\frac{12r^7s^{10}}{3rs^8}$
$2^3+8^2-5^2$
$-6\:+\:2\:.\:-6\:+\:5\::\:-\:1\:$
$\left(x^2-7y^2\right)\left(x^2+7y^2\right)$
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