$\int\frac{1}{\sqrt{x^2+3x-1}}dx$
$l=1+\frac{1}{1+l}$
$\left[\frac{x}{x-y}+\frac{x}{x+y}+\frac{2xy}{x^2-y^2}\right]$
$\left(25-y\right)^2$
$m^2-12m+30$
$\left(-8\:m^2n^3\right)\left(-9\:a^2mn^4\right)$
$0\frac{4^{2}}{4^{3}}$
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