$-\frac{45ab^2}{15ab}$
$p\left(x\right)=x^2-3x-40$
$\left(4x^2-12\right)\left(4x^2-9\right)$
$\sqrt{x}^4.x^4$
$\frac{d}{dx}x^2\:y+3xy^3-x=3$
$2ax-5bd-2a+2ad+5b-5bc$
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