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Homework Help: Best way to solve equations like that

  1. Sep 28, 2010 #1
    Im doing a physics equilibrium problem and I need to solve this equation:

    900cos(x)+600cos(45+x) = 0

    (the angles are in degrees)

    What would be the best way to analytically solve this kind of equation? I tried using the sum-difference formulas but it wasn't able to solve for x.

    Thank you very much
  2. jcsd
  3. Sep 28, 2010 #2
    well the question is essentially only in one variable x

    so instead of adding them what u do is , expland the cos(45+x) term

    then put cosx=t and sinx whill be sqrt(1-t^2)

    and solve the q in t

    and then look at the permissible values of t

    since t belongs to [-1,1]
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