Evaluate: `intdx/(x(3+logx)`

Explanation

`int frac{1}{x(3+log x)} d x`
`

Put log x=t`

Then, `frac{1}{x} cdot d x=d t`

Substitute these values, we get
`
int frac{d t}{3+t}`
`

=ln (3+t)+C`

...