$y'=\frac{x^2}{1+y^2}$
$\lim_{x\to1}\left(\frac{x^3-2x^2-5x+6}{x-1}\right)$
$20x-2x^2$
$\lim_{x\to2}\left(\frac{5^x-9x'7}{2^x-x-2}\right)$
$3m+3m-2m+1$
$\lim_{x\to0}\left(\frac{x^2-3}{x}\right)$
$1\frac{d}{dx}$
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