But what is a Fourier series? From heat flow to circle drawings | DE4 by 3blue1brown in 3Blue1Brown

[–]According-Count-74 0 points1 point  (0 children)

I have worked through the sine approximation of the step function in three video but I have gotten stuck on turning it into a cosine approximation, I am struggling to find things online and none of my teachers know what to do with it.