$45x\left(-6\right)$
$2\cdot5^2-2\cdot3^2\cdot4-4$
$\cos\left(\pi-3\frac{\pi}{2}\right)$
$\left(a^4-1\right)\left(a^4-7\right)$
$3+7+9+3+4$
$3\left(4m\right)$
$4\left(6a-2a\right)$
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