$1-a^2=\left(1-a\right)\left(1+a\right)$
$\left(4b^3\right)\left(5b^5\right)$
$35\cdot35$
$\left(3x-2x^2\right)\left(x^2+2x\right)$
$x^2-4x-\frac{4^2}{2}$
$x^{-2}e^{-2x}$
$\frac{d}{dx}\frac{-3}{x^2}$
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