1.

Evaluate `lim_(xrarr0){(sqrt(1+x)-sqrt(1-x))/(x)}.`

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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