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Math Help - Integration for fourier analysis

  1. #1
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    Integration for fourier analysis

    Hi,

    Can someone please explain to me what is happening from step A to step B in the attached diagram of a Full-Wave rectified Waveform ??

    Ok, he's applying the limits, but from where did he get the "-1"s?

    Attached is also my working for those steps.

    Any help would be appreciated.

    Reference link: Full-Wave Rectified Waveform Help for Fourier Series, Computer Science, Homework Help - Transtutors.com
    Attached Thumbnails Attached Thumbnails Integration for fourier analysis-untitleda.png   Integration for fourier analysis-04052013231.jpg  
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  2. #2
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    Re: Integration for fourier analysis

    Hi,
    It's simple plug in and evaluate, together with some elementary facts on cos. Here's further explanation:

    Integration for fourier analysis-mhfcalc5.png
    Thanks from aritech
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  3. #3
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    Re: Integration for fourier analysis

    Thanks johng that was very helpful.
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  4. #4
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    Re: Integration for fourier analysis

    Another quick question. Why should there be a minus in front of Vm/pi in step A ?

    Also, cos(2n pi - pi) gives -1, but then there is the other -1 we found earlier, so wouldn't that make -2 in the last step ?? -1-1= -2
    Last edited by aritech; May 4th 2013 at 11:07 AM.
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