$-3\left(2\right)\left(-6\right)\left(4\right)\left(-8\right)$
$10\cdot45$
$-\:2\:-\:x\:<\:\frac{1}{2}$
$4^2+9x+81$
$\left(2\sqrt{x}\right)\cdot\left(2\sqrt{x}\right)$
$m^2+6mn+9n^2$
$\left(2x^2+3\right)\left(4x^2+5\right)\left(5x^2+8\right)$
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