$\lim_{x\to\infty}\frac{x^2-16x}{x^2+2x+1}$
$\left(x+7\right)\cdot\left(x-6\right)$
$\frac{d^2}{dx^2}\left(y=x^4+x^3-9\right)$
$\frac{d^4}{dx^4}\left(4x^3-7x^2+3x-9\right)$
$y'=ky$
$-35-\left(-59\right)$
$\int\frac{\sqrt{9-4x^{2}}}{x^{2}}dx$
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