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let f(x)=sqrt(1+x^2) then...

let `f(x)=sqrt(1+x^2)` then

A

f (xy) = f(x) .f(y)

B

f (xy) `ge f(x).f(v)`

C

`f(xy) le f(x).f(y)`

D

None of these

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The correct Answer is:
C
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