$\left(3mn-2\right)\left(mn-m+n\right)$
$n^2+15\cdot n^2-13$
$\left(4c+5\right)^2$
$0-164$
$cos\left(3x\right)=cos\left(0\right)$
$-\frac{\left(-195\right)}{3}$
$6\cdot6\cdot6$
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