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Let f:R^+ -> R is a function defined as ...

Let `f:R^+ -> R` is a function defined as `f(x) = log x`. Find (i) Image of domain of `f`, (ii) `(x: f(x)=-2)` (iii) `f(xy) = f(x) + f(y)`

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The correct Answer is:
`{e^(-2)}`
`f(x)=-2implieslog_(e)x=-2impliesx=e^(-2)`.
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