$\left(5x^2-5\right)\left(-2x^2+1\right)$
$4n-n-1=20$
$10.31\cdot2.43$
$d\left(\frac{-1}{\left(n-1\right)\left(xy\right)^{n-1}}\right)$
$\frac{dy}{dx}\left(\sqrt{9-x^2}\right)$
$20x-7=5+14x$
$4x-18$
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