Let [
Chapter 5, Problem 7(choose chapter or problem)
Let [|f(x)|2 +|g(x)|2]dx be nite, where g(x)= f(x)/(eix1).Let cn bethecoefcientsofthefullcomplexFourierseriesoff(x).Show that N n=N cn 0 asN .
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer