$2ab\cdot3c$
$3y^2+y^2$
$\sqrt[0]{e}$
$6-4\cdot\left(-1-2\right)-3\cdot2\cdot\frac{\left(2\cdot4\right)}{\left(-1\right)}$
$\frac{39z^4+39z^3}{13z^3}$
$\sin2\left(x\right)=-\frac{\sqrt{2}}{2}$
$\left(\frac{2}{3}x+4\right)\left(\frac{2}{3}x-4\right)$
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