engineering mathematics MCQ #5252

If cos(x) = -1/2, what is x in 0 to 2π?

engineering mathematics MCQ #5252

  1. Question 1

    Q1. If cos(x) = -1/2, what is x in 0 to 2π?

    • A) 2π/3, 4π/3
    • B) π/3, 5π/3
    • C) π/2, 3π/2
    • D) π/4, 7π/4

    Answer: 2π/3, 4π/3

    Explanation: cos(2π/3) = -1/2 and cos(2π - 2π/3) = cos(4π/3) = -1/2.