trig

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solve 2sin^2x+sinx-1=0 in the interval [0, 2pi0

  • trig -

    Call sin a new variable y and solve the quadratic equation for y:
    2y^2 +y -1 = 0
    (2y - 1) (y + 1) = 0
    y = sin x = -1/2 or -1

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