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if cos^-1(a) + cos^-1 (b) + cos^-1(c) = ...

if `cos^-1(a) + cos^-1 (b) + cos^-1(c) = 3pi` and `f(1) = 2, f(x + y) = f(x) f(y)` for all `x, y:` then `a^(2f(1))+b^(2f(2))+c^(2f(3))+(a+b+c)/(a^(2f(1))+b^(2f(2))+c^(2f(3))`

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