$3m\cdot3n$
$\frac{\csc\left(x\right)-1}{1-\sin\left(x\right)}$
$\left(\frac{1}{5}z-10z^3\right)^3$
$4+8-5+1-12+6$
$\frac{2}{2x}$
$s^2-4s+16$
$\:|\left(30-12|+|-13|\right)$
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