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lim (h -> 0) (sqrt(x+h) - sqrtx)/h...

`lim _(h -> 0) (sqrt(x+h) - sqrtx)/h`

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`underset(xtoa)lim(sqrt(3x-a)-sqrt(x+a))/(x-a)`
`=underset(xtoa)lim(sqrt(3x-a)-sqrt(x+a))/((x-a))xx(sqrt(3x-a)+sqrt(x+a))/(sqrt(3x-a)+sqrt(x+a))`
`=underset(xtoa)lim((3x-a)-(x+a))/((x-a)(sqrt(3x-a)+sqrt(x+a)))`
=(2)/(2sqrt(2a))=(1)/(sqrt(2a))`
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