From 778d0aeb6e80b1653f0fcf042d76711fd4d49a0d Mon Sep 17 00:00:00 2001 From: Opheliar99 <> Date: Sun, 4 Jul 2010 04:30:07 +0000 Subject: posted solutions of 2 and 3 in pset2 --- Problem Set 2.page | 1 + 1 file changed, 1 insertion(+) diff --git a/Problem Set 2.page b/Problem Set 2.page index de38296..ed138ec 100644 --- a/Problem Set 2.page +++ b/Problem Set 2.page @@ -44,6 +44,7 @@ $\sin x = \frac{e^{ix}-e^{-ix}}{2}$, $\sin^4 x = \frac{{( e^{ix}-e^{-ix} )}^4}{16}$ $= \frac{e^{i 4x}+e^{-i 4x}-4 e^{i 2x} -4 e^{-i 2x}+6}{16}$. +\\ If we express any periodic function $f(x)$ as $f(x) = \sum a_n f_n(x)$, where $f_n(x) = \frac{e^{inx}}{\sqrt{2\pi}}$ and $f_0(x) = \frac{1}{\sqrt{2\pi}}$, -- cgit v1.2.3