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Help with text book (vibration)

  1. Mar 9, 2015 #1
    HI,

    I am studying vibration, came across this in a textbook and can't see the steps taken to substitute e.q 3.5 into 3.3. There is a second derivative x so where does this go, as there is no s^2 either and I can't see how cos was eliminated

    Cheers
     

    Attached Files:

  2. jcsd
  3. Mar 9, 2015 #2
    ##cos^{\prime\prime} (y)=- \cos(y)##
     
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