$\left(\frac{72}{-1}\right)\:\left(-3\right)$
$\int\frac{1}{\sqrt{x^2-2x+3}}dx$
$\left(a+10b\right)\left(a-10b\right)$
$8\cdot5+8$
$4x^3-14x^2+12x$
$\int\frac{13-5x^2}{x}dx$
$\frac{2}{x-1}+\frac{2x}{x+3}=\frac{6}{x}$
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