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Evaluate lim(x to p) (sqrt(1 + x) + sqr...

Evaluate `lim_(x to p) (sqrt(1 + x) + sqrt(1 - x))/(1 - x)`

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We have `underset(x to 0)(lim) (sqrt(1 + x) + sqrt(1 - x))/(1 - x) = (sqrt(1 + 0) + sqrt(1 - 0))/(1 - 0) = (sqrt(1) + sqrt(1))/(1) = 2`
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