It's not posted on the website, so here's in case anyone needs it.
Find the Fourier Sine Series for:
A line starting at the origin, increasing until (Pi/2,1) and then decreasing until (Pi,0). (Draw it to get a visual)
$ a_n = \frac{2}{\Pi} \int^{\Pi}_{0} f(x) \sin(nx) dx $
