$\lim_{x\to-1}\left(\frac{x^4+2x^2+x^2}{x+1}\right)$
$-2448+\left(-2448\right)$
$\frac{dy}{dx}=-2xy^2,y\left(0\right)=2$
$5s^2-3s+2$
$13\cdot0.20$
$\int\frac{x}{x^4-4}dx$
$x^2-x=3$
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