$\int\frac{x^2}{x^2-8}dx$
$-5.200-1.500+4.500+2.100$
$\left(4xy\:+\:5z\right)\left(4xy-5z\right)$
$21-6x$
$a\cdot b\left(1+4a\cdot b\right)$
$\left(\frac{2}{5}m^4n-\frac{5}{2}mn^4\right)^2$
$\sqrt{\frac{1-x^2}{1+x^2}}$
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