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The positive and negative halves of a complex wave are symmetrical when
(a) it contains even harmonics
(b) phase difference between even harmonics and fundamental is 0 or π
(c) it contains odd harmonics
(d) phase difference between even harmonics and fundamental is either π/2 or 3π/2.
The positive and negative halves of a complex wave are symmetrical when
(a) it contains even harmonics
(b) phase difference between even harmonics and fundamental is 0 or π
(c) it contains odd harmonics
(d) phase difference between even harmonics and fundamental is either π/2 or 3π/2.
(c) it contains odd harmonics