$-1720+-8930$
$\left(\:x\:+\:25\:\right)\:\left(\:x\:-\:30\:\right)$
$4\frac{dy}{dx}=e^{-2x-3y}$
$0,52+0,27$
$\csc^2\left(x\right)\cot\left(x\right)+\cot^2\left(x\right)$
$2x+y-z=20$
$\frac{dy}{dx}\left(x^3y-2xy^2=1\right)$
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