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        "intro": "In this Section we examine how to obtain Fourier series of periodic functions which are either <i>even<\/i>\nor <i>odd<\/i>. We show that the Fourier series for such functions is considerably easier to obtain as, if the\nsignal is <i>even<\/i> only cosines are involved whereas if the signal is<i> odd<\/i> then only sines are involved. We\nalso show that if a signal reverses after half a period then the Fourier series will only contain odd\nharmonics.",
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