$\frac{d}{dx}\left(x^2-xy^2+3xy\:-18\right)$
$-6+3-+-2$
$70,927+21,892$
$\left(4x^2y^2-6x\right)$
$-38-87$
$6\cos\left(x\right)+\sqrt{18}=0$
$235\cdot1\cdot58$
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