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Has my teacher been wrong here

  1. Aug 28, 2009 #1
    http://i28.tinypic.com/qz54aw.jpg

    he reduced 2 points
    and put s on the numerator making it cosine formula.
    also i clearly transformed sinus
     
  2. jcsd
  3. Aug 28, 2009 #2

    CompuChip

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    Probably it is because
    [tex]\sin(t) = -\cos(t - 3\pi / 2)[/tex]
    and not
    [tex]-\sin(t - 3\pi / 2)[/tex]
     
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