$\lim_{x\to-3}\left(\frac{4x^2-2x-3}{x^3+27}\right)$
$\frac{x-1}{x^2-4x+4}$
$\left(x-\sqrt{x^2-12}\right)^2$
$-526\:+\:-158\:$
$2x^2-y^2+14=0$
$x^2e^x-3xe^x-4e^x=0$
$-6x^2y+4x^2y$
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