# Thread: Need Help in Fourier Transformation

1. ## Need Help in Fourier Transformation

I have been trying to find equation for:
1. Square wave
2. Triangle wave
3. Sawtooth wave
using the Fourier transformation.
The results i have got involve the infinite series using only sine terms. However i wanted to know whether it is possible to express the same using cos terms?
If not then why?

2. Originally Posted by amarnathmukherjee
I have been trying to find equation for:
1. Square wave
2. Triangle wave
3. Sawtooth wave
using the Fourier transformation.
The results i have got involve the infinite series using only sine terms. However i wanted to know whether it is possible to express the same using cos terms?
If not then why?
To have a Fourier series consisting only of cosines requires that the function be even (on the interval [-L,L], or extended to an even function)

CB