$6+5+4-3-13-6-6-9+16+6$
$2+4cd-3c-6d$
$\frac{d}{dx}\sqrt{2x^2-23}\:$
$16x^2y^3-4x^2y^3+2xy-x^2y^2+xy$
$-6x^2-6x\:-\:6$
$\sin^2\left(x\right)-1=2cos^2\left(x\right)$
$-9b^2.-b^{2+x}$
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