If f^(prime)(x)=1/(-x+sqrt(x^2+1)) and ...

If `f^(prime)(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)` (b) 1 (c)`1+sqrt(2)` (d) none of these

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