$\frac{dq}{dt}=qtantsec^2t$
$\int\left(\frac{x}{x-2m}\right)dx$
$8+7-11.3-2.8+6-18-9+3$
$16-4^2+20$
$\left(24b+56b\right)$
$\frac{d^2x}{dx^2}=-x$
$\left(21x+4\right)^2$
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