Question: solve 2 cos x + 1 = 0 on the interval x e [0,2pi]. a) x = 2pi/3, x = pi/3 b) x = 2pi/3,

solve 2 cos x + 1 = 0 on the interval x e [0,2pi]. a) x = 2pi/3, x = pi/3 b) x = 2pi/3, x = 4pi/3 c) x = pi/3, x = 5pi/3 d) x = pi/3, x = 4pi/3

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