$\left(-18\right)-\left(-31\right)-\left(-3\right)-\left(-16\right)$
$289-\left(-2112\right)$
$\lim_{x\to\infty}\left(1+\frac{4}{x^2}\right)^x$
$\frac{dy}{df}=2y$
$2.15=9$
$\frac{dx}{dx}=2$
$3ln\:2x+ln\:4x$
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