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Has my teacher been wrong here

  1. Aug 28, 2009 #1

    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


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    Science Advisor
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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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