$2ab-6b+4a-12$
$2abc^3+2abc^2-50abc-50ab$
$( \frac { 1 } { 2 } x - 2 ) ^ { 2 }$
$r_{\left(ab\right)}=a_{2}-4+2ab+b_{2}$
$4a^3b^4\:x\:3a^2b^3$
$\frac{d}{dx}\sqrt{x^2-y^2}$
$\sqrt{\frac{\sqrt[3]{x}\sqrt[3]{y^2}}{\sqrt[5]{x^2}}}$
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