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Evaluate : `lim_(xrarr0) (sqrt(1+x)-sqrt(1-x))/( x)` |
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Answer» `underset(xrarr0)"lim" (sqrt(1+x)-sqrt(1-x))/(x)` `=underset(xrarr0)"lim"(sqrt(1+x)-sqrt(1-x))/(x)xx(sqrt(1+x)+sqrt(1-x))/(sqrt(1+x)+sqrt(1-x))` `=underset(xrarr0)"lim"((1+x)-(1-x))/(x(sqrt(1+x)+sqrt(1-x)))` `=underset(xrarr0)"lim"(2)/(sqrt(1+x)+sqrt(1-x))` `=(2)/(sqrt(1)+sqrt(1))=(2)/(2)=1`. |
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