$3xy\:-\:4xz\:+\:2yz;\:x=1;\:y=3\:;\:z=-2$
$\left(2m-\frac{1}{2}y\right)^2$
$\left(x-21\right)\left(x+4\right)$
$-56-\left(-7946\right)$
$\int\:3x\:cschx^2\:dx$
$\frac{dy}{dx}=x^2-2x^2y$
$3\ln\left(x\right)-\ln\left(x\right)-\ln\left(9\right)=0$
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