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Sinusoidal Function

  1. May 22, 2004 #1
    hello there,
    how do i solve over [0,2pi) for sin(2x)+sin(x)=0
    thanks for what help you can give
    RansidMeat
     
  2. jcsd
  3. May 22, 2004 #2
    Yay, problem solved.

    cookiemonster
     
  4. May 22, 2004 #3

    AKG

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    Science Advisor
    Homework Helper

    sin(2x) + sin(x) = 0
    2sin(x)cos(x) + sin(x) = 0
    2sin(x)cos(x) = -sin(x)
    2cos(x) = -1 OR sin(x) = 0
    cos(x) = -0.5 OR x = 0, pi
    x = 2pi/3, 4pi/3 OR x = 0, pi
    x = 0, (2/3)pi, pi, (4/3)pi.
     
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