# Simplification question

1. Apr 7, 2015

### theone

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 $$\frac{mls^2}{(M+m)(I+ml^2)}$$ or something?

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2. Apr 7, 2015

### gleem

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.