$-a\cdot b+2b-2c+3a+2c-3b$
$\lim_{x\to0}\left(2e^{-x^{-2}}x^{-3}\right)$
$\frac{x^2+3x}{x+1}$
$\int\left(\frac{2senx+3tanx}{cosx}\right)dx$
$4+4\log3y-\frac{\log3y}{4}$
$\left(13\left(76\right)\right)$
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