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Let f((x+y)/(2))=1/2 |f(x) +f(y)|for all...

Let `f((x+y)/(2))=1/2 |f(x) +f(y)|`for all real x and y, if `f '(0)` exists and equal to `(-1), and f(0)=1 ` then `f(2)` is equal to-

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