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Solve the trig equations 2sin^2(x) + sin(x) - 1 =0

  1. Jan 19, 2008 #1
    1. The problem statement, all variables and given/known data

    Find all values of x in the interval 0<=x<=2pi for which 2sin^2(x)+sin(x)-1=0.

    2. Relevant equations

    3. The attempt at a solution

    I have no idea.

    I spent awhile trying to figure it out on my graphics calculator but couldn't figure it out.

    I have only been told how to solve trig equations where there is 1 trig function, lol.

    any help would be great thanks.
  2. jcsd
  3. Jan 19, 2008 #2
    This equation is quadratic, the variable is sin(x). Can you solve now?
  4. Jan 19, 2008 #3

    quadratic formula ...

    for trig

    x=trig identity
  5. Jan 19, 2008 #4
    o rite i see.

    I think I have the right answers lol

  6. Jan 19, 2008 #5
    You can always check it by plugging it back into your original equation.
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