2cos(theta) = -1
cos(theta) = -1/2 in quadrant II and III
theta = 120 degrees and 240 degrees (60 degree reference angle in each case)
in radians 120 * PI/180 = 2/3 PI
240 * PI/180 = 4/3 PI
Anna M.
asked • 02/17/21Find all solutions to 2 cos ( θ ) = − 1 on the interval 0 ≤ θ < 2 π
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