Ononot — Given f(x) = \frac{\sqrt{1+x} - \sqrt{1-x}}{x}, to make f co

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Limits & Continuityhard

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Given $f(x) = \frac{\sqrt{1+x} - \sqrt{1-x}}{x}$ , to make $f$ continuous at $x=0$ , what must $f(0)$ be?