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If 2f(xy) =(f(x))^(y) + (f(y))^(x) for a...

If `2f(xy) =(f(x))^(y) + (f(y))^(x)` for all `x, y in R` and `f(1) =3`, then the value of `sum_(t=1)^(10) f(r)` is equal to

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