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Simple harmonic motion and damping

  1. Aug 12, 2012 #1
    I have to solve the following D.E. which describes how the amplitude of oscillation r, changes with time.


    [tex]r=f(t)[/tex]



    [tex]\frac{dr^{2}cos^{2}t}{dt}=rsint[/tex]



    How do I find r?
     
  2. jcsd
  3. Aug 15, 2012 #2
    Start by applying the product rule.
     
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