$\frac{1-2-2-3}{1}$
$0.6\cdot0.19$
$\int\left(cos2t\right)dt$
$-9+4-\left(2+9-3\right)\left(-2\right)$
$\left(3+x^2\right)\left(x^2+3x\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x+20}-4}{x+4}\right)$
$\left(\:2mn-6\right)\left(2mn-22\right)$
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