$lnx^2-x^{-2}$
$18d^2-37d+15$
$0,1\frac{di}{dt}+50i=30$
$\sin\left(a+270\right)$
$-12\left(-8\right)$
$\left(x^3\:-\:27\right):\left(x\:-\:3\right)\:$
$\frac{dy}{dx}=4xy=8$
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