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Let f:R->[0,oo) be a derivable function ...

Let `f:R->[0,oo)` be a derivable function which satisfies `f(x^2+y^2)=f(2xy)+f(x^2-y^2) AA x, y in R` Also `f(1)=2` On the basis of above information, answer the following questions :`f(3) + f(4)` is equal to -

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