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Evaluate `lim_(xrarr0){(sqrt(1+x)-sqrt(1-x))/(x)}.` |
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Answer» We have, `lim_(xto0){(sqrt(1+x)-sqrt(1-x))/(x)}=lim_(xto0){((sqrt(1+x)-sqrt(1-x)))/(x).((sqrt(1+x)+sqrt(1-x)))/((sqrt(1+x)+sqrt(1-x)))}` `=lim_(xto0)({(1+x)-(1-x)})/(x(sqrt(1+x)+sqrt(1-x)))` `=lim_(xto0)(2x)/(x(sqrt(1+x)+sqrt(1-x)))` `=lim_(xto0)(2)/((sqrt(1+x)+sqrt(1-x)))=1" "["putting"x=0].` |
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