engineering mathematics MCQ #5570

If sin(x) = -1 / 2, what is cos(2x)?

engineering mathematics MCQ #5570

  1. Question 1

    Q1. If sin(x) = -1 / 2, what is cos(2x)?

    • A) 1 / 2
    • B) -1 / 2
    • C) 1
    • D) -1

    Answer: 1 / 2

    Explanation: Using cos(2x) = 1 - 2sin²(x), we find cos(2x) = 1 - 2 * (-1 / 2)² = 1 / 2.