$x4-100$
$\frac{1}{4}=\frac{3}{x}$
$\lim_{x\to0}\left(\frac{4x}{\sqrt{1-2x}-\sqrt{1+2x}}\right)$
$\left(x^2-x-1\right)\left(2x+2\right)$
$18\cdot0$
$\frac{dy}{dx}=\frac{3-y}{2-x}\:,x=2$
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