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Function f(x)=(log)a x is increasing on ...

Function `f(x)=(log)_a x` is increasing on `R` , if (a) `01` (c) `a<1` (d) `a >0`

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`a>1`
` f(x) quad log _{a} x=frac{log _{x}}{log _{a}}`
` f^{prime}(x)=frac{1}{x log a}`
We have: f(x) is increasing on R.
`Rightarrow f^{prime}(x)>0, forall x in R `
` ...
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