- #1

- 144

- 0

1. Homework Statement

1. Homework Statement

Find the Fourrier coefficients in the annulus problem of the text.

uxx+uyy=0 in 0<a²<x²+y²<b²

u=g(θ) for x²+y²=a²

u=h(θ) for x²+y²=b²

## Homework Equations

The solution is

## The Attempt at a Solution

I have the solutions but when I solved it for Co and Do I didn't get the same thing, but or all the other coefficients I got the right thing.

Here is the problem

To get Co and Do I did the integral on both sides from 0 to 2π to get rid of the sum.

So I ended up with

But the solution give a factor 1/π Before the integral of h and g , why ?

Thank you !