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Give the full solution set of cos x = -1, with n an integer.
Ax = 2nπ + π/2
Bx = 2nπ
Cx = (2n+1)π
Dx = nπ/2
Answer & Solution
Correct answer: C. x = (2n+1)π
Cosine equals -1 at π and repeats every 2π, giving odd multiples of π.
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