$\lim_{x\to0}\frac{n}{\sqrt{n^3+2n-2}}$
$6x^2-23x+20$
$( 1 - 2 r ) ^ { 3 }$
$21-\left[11-\left\{6-\left(32-4\right)\right\}\right]$
$a^4-2a^2b^2+b^4$
$5\left(x+3\right)\:si\:x\:vale\:3$
$\lim_{x\to0}\left(\frac{\sqrt{x^2-4}}{4x}\right)$
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