$x^2+6x-168=0$
$\int6xsin\left(3x\right)dx$
$\frac{1}{2}^{-1}$
$\frac{x^4-3x^3+2x-3\:}{x^3-2}$
$\frac{5}{x+1}-\frac{x+4}{x+1}$
$\left(e^2-5\right)\left(e^2+9\right)$
$\lim_{x\to0}\left(\frac{e^{\left(2x\right)}}{x^2}\right)$
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