$\int\left(-4xe^{-4x^2}\right)dx$
$\frac{2}{x+3}-\frac{x}{2}$
$\frac{1}{2}a-\frac{3}{4}a+\frac{3}{8}a$
$\left(x-12\right)\left(x-7\right)$
$\lim_{x\to1}\left(ln\left(x\right)\cdot ln\left(x-1\right)\right)$
$\frac{1}{cot\:1.2079856}$
$\left(x+a\right)\left(x-2\right)$
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