# Integration of lnx

In this tutorial we shall explain integration of natural logarithmic function $\ln x$ it is an important integral function, but it has no direct method to find we shall find the integration of $lnx$ by using integration by parts method.
The integration of $lnx$ is of the form

By using integration by parts, it must have at least two functions, it in this function it has only one function that is $\ln x$, now consider second function as $1$. Now the integration becomes

Take first function is $\ln x$ and second function will be $1$
Using formula for integration by parts, we have

Equation (i) becomes using above formula, we have

Now in further study in integration we can use this integration of $lnx$ as a formula.