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)- 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 ▸

The General Form of the equation of a circle is x^2 + y^2 + 2gx +2fy + c = 0. Find the centre of the circle and the radius of the circle in terms of g f and c.


How to differentiate y=(x^2+4x)^5


Show that the equation 2sin^2(x) + 3sin(x) = 2cos(2x) + 3 can be written as 6sin^2(x)+3sin(x) - 5 = 0. Hence solve for 0 < x < 360 degrees. Giving your answers to 1.d.p.


Find the stationary points of the curve y (x)= 1/3x^3 - 5/2x^2 + 4x and classify them.