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Let f be a real valued function satisfyi...

Let f be a real valued function satisfying
`2f(xy) = {f(x)}^(y) + {f(y)}^(x), AA x, y in R` and f(1) = 2, then find `underset(K = 1)overset(2008)sum f(K)`

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`2^(2009)-2`
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