How do you solve the integral of ln(x)

This will use the process of integration by parts.

First, notice that ln(x)=ln(x)*1.

So, the integral of ln(x) is the integral of ln(x)1. The process of integration by parts is;  int(vdu/dx)dx=vu - int(dv/dx*u)dx.

Set ln(x)=v, 1=du/dx, so int(ln(x)*1)dx = ln(x)x - int(1/xx)dx = xln(x)-int(1)dx = xln(x)-x+constant.

And you're done!

YP

Related Maths A Level answers

All answers ▸

What is a Tree Diagram?


When finding the turning points of a curve, how can I tell if it is a maximum, minimum or a point of inflection?


Integrate the function f(x) where f(x)= x^2 +sin(x) + sin^2(x)


How can I determine the characteristics of a curve on an x-y set of axis (eg. points of intersection, stationary points, area under graph)?