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Let f((x+y)/(2))=(f(x)+f(y))/(2) and f(0...

Let `f((x+y)/(2))=(f(x)+f(y))/(2) and f(0)=b.` Find `f''(x)` (where`y` is independent of x), when `f(x)` is differentiable.

A

0

B

1

C

a

D

None of these

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