$\int\left(\cos\left(\frac{1x}{31\:}\right)\right)dx$
$\frac{-x^3-x^2+3x+2}{x-2}$
$7\left(-7\right)-2\left(1\right)+3$
$\lim_{x\to4}\left(\frac{3x-1}{\left(x-4\right)\left(x+1\right)}\right)$
$\int x ^ { - 45 } d x$
$\left(6-2x-x^2\right)^2$
$11d+5f-21d+5-8$
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