1.

The area bounded by the x-axis, the curve \[y=f(x)\], and the lines x = 1, x = b is equal to\[\sqrt{{{b}^{2}}+1}-\sqrt{2}\] for all b > l, then f(x) is

A. \[\sqrt{x-1}\]     
B. \[\sqrt{x+1}\]
C. \[\sqrt{{{x}^{2}}+1}\]
D. \[\frac{x}{\sqrt{1+{{x}^{2}}}}\]
Answer» E.


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