engineering mathematics MCQ #5264

If cos(x) = -1/2, then x =

engineering mathematics MCQ #5264

  1. Question 1

    Q1. If cos(x) = -1/2, then x =

    • A) 2π / 3
    • B) π / 3
    • C) π / 2
    • D) π

    Answer: 2π / 3

    Explanation: cos(2π / 3) = -1/2. cos(x) = -1/2 implies x = 2π / 3 in the second quadrant.