Page 12 - Modul Fismat Deret Fourier


2
Periode  L 2   L  

1 
a   f (x )dx
0
 
1  0  
a 0    0dx   1dx 

 0 
1 
a 0   dx

0
x  
a 0    0 


a   0
0

a 0  1

1 L n x
a   f (x ) cos dx
n
L L
L
1  n x
a n   f (x ) cos dx

 
1 
a n   f (x ) cos nxdx


1  0  
a n    0 cos nxdx   1 cos nxdx 

 0 
1 
a n   cos nxdx

0
1  
a n  n sin nx  0 

1
a n  n sin n  sin  0

a n  0