Q. The trigonometric Fourier series for a complex wave will contain positive cosineterms only when (Solved)
1. it contains even harmonics
2. its two half-cycles are symmetrical
3. its value is zero at 0= n/2, 3n/2 et
4. its value is zero at 0= n, 2n etc.
- c. its value is zero at 0= n/2, 3n/2 etc.