Precalculus

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Find all solutions to 2 cos(theta) = - 1 on the interval 0 less than or equal to theta less than 2 pi

Give your answers as exact values, as a list separated by commas.

  • Precalculus -

    cosine is negative in II or III
    and I know cos 60° = cosØ/3 = 1/2

    so for your cosØ = -1/2

    Ø = 180-60 =120° or Ø = 180+60 = 240°
    in radians
    Ø = 2π/3 or Ø = 4π/3

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