$\frac{dy}{dx}=10x-x^2$
$x-10+9x-3$
$4^{10}\cdot4^{-7}$
$4-x^21+x^2$
$15n+45$
$\lim_{x\to-\sqrt{13}}\left(\frac{x^2-13}{\sqrt{x^2+3}-4}\right)$
$\left(1-\frac{1}{4}x^2\right)^2$
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