$\lim_{x\to0}\left(\frac{\sqrt{6+t}-\sqrt{6-t}}{t}\right)$
$\frac{dy}{dx}=x-\frac{1}{x}\cdot y$
$x^2-12x=-36$
$x-8\:x+2$
$3^1-3^{-1}$
$\lim_{x\to1}\frac{x-4}{\sqrt{x}-2}$
$2700+1024$
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