The dc component a The Fourier coefficients ak Plot the spectrum between k=-7 to k=+7

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Q: But the phase angle plot does exist. I'm not sure why you are saying it doesn't. Its in my textbook.

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Fourier Series

Most of the incidents studied in the field of Engineering and Science as a function of time. For example, current and voltage are in the alternating current circuit. These occasional activities can be analyzed in the activity components (fundamental frequency and harmonics) through a process called Fourier analysis.