$\sqrt{4+9}$
$3\left(2\right)^3\left(-3\right)^2$
$587-135$
$\left(-86\right).\left(+4\right)$
$6,5-4,91$
$\int\left(\frac{x+3}{\left(5-x\right)^{\frac{1}{2}}}\right)dx$
$\lim_{x\to7}\left(\frac{x-7}{x^2+5x-14}\right)$
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