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``First we will rewrite the radical number using rational exponent.
`==gt sqrtx = x^(1/2) `
`==gt log sqrtx = log x^(1/2)`
Now we will use logarithm properties to simplify.
We know that `log a^b = b *log a`
```==gt log sqrtx = log x^(1/2) = (1/2) log x`
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