The Fourier series coefficient for the given periodic signal

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The Fourier series coefficient for the given periodic signal given below is—

1. 1
2. cos πK
  2
3. sin πK
  2
4. 2

Correct Option: D

Fourier series coefficient

a_k =	1		^T/2	x(t).e^–jkω0tdt
	T		_-T/2

a_k =	1		^T/2	10.e^–jkω0tdt
	T		_-T/2

10	1 =	10	= 2
T		5