What is t? Or should it be ?
Nevermind, I figured it out on my own.
It's part of a fourier series. I found out that for all the expression will yield zero and for all the expression will yield
For expressed as an uneven integer, we can rewrite it as thus if you insert this and change to in the new expression, the work is then complete. Sorry for not writtign my question that good, my bad.