- #1

Kqwert

- 160

- 3

## Homework Statement

Hello,

i am trying to do find the Fourier series of abs(sin(x)), but have some problems. As the function is even, bn = 0. I have calculated a0, and I am now working on calculating an. However, when looking at the solution manual, they have set up one calculation for n > 1 (i.e. a2, a3, a4, a5... and so on) and one for n = 1 (i.e. a1).

**Why?**