give exact values only
2 cos Θ + 1 = 0
2 cos Θ = -1
cos Θ = -1/2
Θ = 2π/3 or 4π/3
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2 cos Θ + 1 = 0
2 cos Θ = -1
cos Θ = -1/2
Θ = 2π/3 or 4π/3