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Homework Help: Elementary differential equations: Linear equations

  1. Sep 16, 2012 #1
    1. The problem statement, all variables and given/known data





    changed cos^2∅ to 1/2+1/2cos2∅
    rcos∅=1/2∅ + 1/4 sin2∅+c

    the books answer is not even close to mine they have r=(∅+c)cos∅

    Where did I go wrong?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Sep 16, 2012 #2


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    ##e^{-\ln\cos\phi}=e^{\ln[(cos\phi)^{-1}]} =\frac 1 {\cos\phi}##
  4. Sep 16, 2012 #3
    Thanks LC!
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