# Integral of 1 Over x lnx

In this tutorial we shall find the integration of 1 over x lnx function. To evaluate this integral we shall use the method of substitution of integration.

The integration is of the form

To solve this integration, putting $z = \ln x$ and differentiating, we have $dz = \frac{1}{x}dx$, so the given integral (i) takes the form

Using the formula of integration $\int {\frac{1}{x}dx = \ln x + c}$

By putting the value $z = \ln x$ in the evaluated integral, we have