From 10a58589f3324625884995a68486b8cda213f9a2 Mon Sep 17 00:00:00 2001
From: siveshs <siveshs@gmail.com>
Date: Fri, 2 Jul 2010 14:00:01 +0000
Subject: still testing

---
 Fourier Series.page | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Fourier Series.page b/Fourier Series.page
index 9c20925..3e450d3 100644
--- a/Fourier Series.page	
+++ b/Fourier Series.page	
@@ -45,7 +45,14 @@ $$
 & = & \frac{1}{2}\sin(x) + \frac{1}{2}\sin(3x)\\
 \end{array}
 $$
-    
+  
+Thus, we see that both these functions could be expressed as sums of sines and cosines. It is possible to show that every product of trignometric functions can be expressed as a sum of sines and cosines:  
+  
+$$
+\begin{arary}{ccl}
+e^{i\theta} & = & \cos \theta + i \sin \theta\\
+\end{array}
+$$
 ##What is the Fourier series actually?</b>
 
 ##Why is Fourier series useful? </b>
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