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Simplification question

  1. Apr 7, 2015 #1
    1. The problem statement, all variables and given/known data
    Does anyone know what was done to go from the first line to the second?

    2. Relevant equations

    3. The attempt at a solution
    I don't know what sequence of steps they did after the angle was factored.
    I think both sides were then multiplied by [tex]\frac{mls^2}{(M+m)(I+ml^2)}[/tex] or something?

    Attached Files:

  2. jcsd
  3. Apr 7, 2015 #2
    From the original equation get a common denominator, mls2. for all terms. collect terms in s4,s3,s2 and s.
    write Φ/U divide the numerator and denominator by the coefficient of the s4 term which is q. DA DA.
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