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Homework Help: Splitting a Fraction

  1. Sep 22, 2009 #1
    I'm looking at this particular splitting of a fraction in a book and I'm not completely sure what rule is being invoked. Here it is:

    http://www.apthtml.com/images/split.png [Broken]

    Can anyone identify what this is?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 22, 2009 #2

    chroot

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