$\left(6x+4\right)\left(6x-9\right)$
$\left(7z^2\right)^2$
$x^5cos^23y$
$\left(7x^4\right)\left(-3x^2\right)$
$\left(2-m\right)\left(4+2m+m^2\right)$
$-7+-16+2$
$\frac{1}{n}x^n$
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