$\frac{d^2}{dx^2}\left(x^{23}-23x^{22}\right)$
$-4216+\left(-3972\right)$
$k-2k$
$4\sqrt{75}$
$\left(\frac{2}{3}+\frac{4}{5}x^9\right)^2$
$\frac{x^5-6x^3+7x-1}{x+3}$
$0.02\cdot7$
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