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[" 4.If "f'(x)=(1)/(-x+sqrt(x^(2)+1))" a...

[" 4.If "f'(x)=(1)/(-x+sqrt(x^(2)+1))" and "f(0)=-(1+sqrt(2))/(2)" ,then "f(1)],[" is equal to "],[" a."-log(sqrt(2)+1)quad " b."1],[" c."1+sqrt(2)quad " d.none of these "]

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