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Let f(x+1/y) +f(x-1/y) =2f(x) f(1/y) A...

Let `f(x+1/y) +f(x-1/y) =2f(x) f(1/y) AA x, y in R , y!=0` and f(0)=0 then the value of `f(1) +f(2)=`

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