The graph shows the calling charges of two cell phone companies. At how many minutes do the two companies charge the same amount
?
Α. Ο
B. 15
C. 20
D 4
Α. Ο
B. 15
C. 20
D 4
2 answers:
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The Fourier series expansion of
where we have
The coefficients of the cosine series are
When
Meanwhile, the coefficients of the sine series are given by
So the Fourier series expansion for