Single correct · +4 / −1

If cos x = 1/2 and x is in [0, 2π], then x =

  1. (a) π/3, 5π/3
  2. (b) π/3, 2π/3
  3. (c) 2π/3, 4π/3
  4. (d) π/6, 5π/6
Answer and solution

Answer (a) π/3, 5π/3

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