$-6\left(-60\right)\left(-4\right)$
$-2m\cdot m^2$
$\left(3m+2-7x\right)^2$
$\left(1-\sin\left(x\right)\right)\csc^2\left(x\right)=\cot^2\left(x\right)$
$\frac{20n^3+15n^2}{20n^2+10n}$
$4x-\frac{3}{2x^2}$
$a^2+10a+21=0$
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