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July 25th, 2014, 01:21 PM   #1
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Series expansion of the signum function of sine


I just read a physics paper and there it expands signum of a sine function as below:


How can we expand sgn(sin(wt)) like this?

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July 25th, 2014, 01:25 PM   #2
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I dunno, kind of like this?
Fourier Series--Square Wave -- from Wolfram MathWorld
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July 26th, 2014, 12:11 AM   #3
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