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Question
Evaluate`int (1)/(x(3+log x))dx`
Solution
`int (1)/(x(3+log x))dx`
Put `3+log x=t`
`1/x dx=dt`
∴ `int dt/t+c`
`int dt/(3 +t)`
= `log [3 + t] + c
= `log (3+log x)+c`
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