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Algebra question please help!

  1. Mar 29, 2012 #1
    1. The problem statement, all variables and given/known data

    Sorry, not really a homework question, just practicing for a test online.

    Can someone explain how this person simplified this line.

    2. Relevant equations

    A(Ls) = (L - 2*Ls)*Ls*sin(beta) + Ls*sin(beta)*Ls*cos(beta)

    becomes

    A(Ls) = sin(beta)*[cos(beta) - 2]*Ls^2 + L*sin(beta)*Ls

    **INFO**

    Lb = L - 2*Ls
    h = Ls * sin(beta)
    w = Ls * cos(beta)
    A = Lb * h + 2 * 1/2 * h * w

    Thank you, would be great help. :)
     
  2. jcsd
  3. Mar 30, 2012 #2
    He doesn't use any formulas at all. The only thing he is doing is changing the place of the brackets.

    Hint: Start with eliminating the brackets in the term (L - 2*Ls)*Ls*sin(beta).
     
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