The trigonometric Fourier series for a complex wave will contain positive cosineterms only when

its value is zero at 0= n, 2n etc.

its two half-cycles are symmetrical

its value is zero at 0= n/2, 3n/2 etc.

The trigonometric Fourier series for a complex wave will contain posit

1.	The trigonometric Fourier series for a complex wave will contain positive cosineterms only when
A.	it contains even harmonics
B.	its two half-cycles are symmetrical
C.	its value is zero at 0= n/2, 3n/2 etc.
D.	its value is zero at 0= n, 2n etc.
Answer» D. its value is zero at 0= n, 2n etc.