$\left(-2\right)\left(2\right)\left(-2\right)\left(1\right)\left(-1\right)\left(5\right)$
$16k^2-1$
$-9a^2-12ab-b^2$
$-2-3-5-7-9-11-13-15$
$3\cos\left(x\right)=2\cot\left(x\right)$
$\left(-\sqrt{\frac{3}{4}}x\right)\left(-\frac{1}{3}\sqrt{2}y\right)^6$
$\left(2m-3n^3\right)^3$
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