- #1

- 13

- 0

[tex]f(t) = \frac{2}{\pi} + \sum_{n=1}^{\infty}\frac{4cos(2nt)}{\pi-4\pi n^2}[/tex]

I'm pretty sure that's right, but now I need to evaluate the sum using the above Fourier series:

[tex]\sum_{n=1}^{\infty}\frac{(-1)^n}{4n^2-1}[/tex]

I don't really have any clue about where to start.