$-0.49x^2-1.4xy\:-y^2$
$-3+\left(2\right)\cdot\left(-3\right)$
$x\:+\:2y\:-z\:=\:-5$
$x^2+y^2+16=0$
$\left(1+\frac{3}{\infty}\right)^{\infty}$
$\left(1+3x^2\right)\left(1-3x^2\right)$
$\frac{dy}{dx}=3xlny$
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