$3a^2-3ab-b^2+4ab+6b$
$49-a^2$
$x^2+16x=5$
$\frac{dy}{dx}=\frac{2xy}{x^2+3}$
$y=arc\:cos\left(\frac{1}{2}x\right)$
$-g+-5g-3g$
$\left(2ab-3bc\right)^2$
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