$\lim_{x\to-1}\left(\frac{x^2-3x+2}{x^2-4}\right)$
$\left(-3\right)-3+\left(-2+5\right)-\left(2+1\right)$
$dy=2xdx$
$17\left(-33\right)$
$\lim_{x\to0}\left(\frac{x^3}{x^2+x\:}\right)$
$4n^2+2n+6=0$
$2+3x-2x^2$
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