$\left(3+2\right)\left(4+5\right)$
$\int\left(xe^{31x}\right)dx$
$x^2-a^2$
$\int\left(\frac{1}{1-3x^2}\right)dx$
$4\cdot3-1-2$
$6n^4\:-\:12n^2\:+\:6$
$\lim_{x\to0}\left(\frac{\tan^2\left(3x\right)}{x^2\cos^2\left(2x\right)}\right)$
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