Given that \(f (x)\)is a differentiable function of \( x\) and that \(f(x)\) . \(f (y)\) = &nbsp...

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Given that \(f (x)\)is a differentiable function of \( x\) and that \(f(x)\) . \(f (y)\) =  \(f (x) \)+ \(f (y)\) + \(f (xy) -2\)
and that  \(f (2) =5\).
Then \(f (3)\) is equal to?
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