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Quick Easy wave question

  1. Feb 9, 2009 #1
    This has nothing to do with homework, so I hope this is OK

    (I graduated college in 07 :) )

    How do you draw one wave lagging another by 90 degrees?

    My girlfriend and I can't remember how to draw this out.
  2. jcsd
  3. Feb 9, 2009 #2
    wooooow, nevermind

    that was extremely obvious
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