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Let f be a function such that f(x+f(y))=...

Let f be a function such that f(x+f(y))=f(f(x))+f(y) `forall x, y in R` and f(h)=h for 0where `epsilon >0`, then determine f'(x) and f(x).

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MOTION-DIFFERENTIABILITY-Exercise - 4 | Level-I Previous Year | JEE Main
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