$2m\cdot2mn$
$\left(x-1\right)\left(x+\frac{1}{2}\right)$
$-256-123$
$\frac{8x+2x+3}{4x^2+6x+1}$
$23-\left(-714\right)$
$2\:sin^2\left(x\right)+1\:sin\left(x\right)=0$
$4x^2-8x+13$
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