engineering mathematics MCQ #5568

What is the value of cos(2x) if cos(x) = 1 / √2?

engineering mathematics MCQ #5568

  1. Question 1

    Q1. What is the value of cos(2x) if cos(x) = 1 / √2?

    • A) 0
    • B) 1 / 2
    • C) 1
    • D) -1 / 2

    Answer: 0

    Explanation: Using cos(2x) = 2cos²(x) - 1, we find cos(2x) = 2 * (1 / 2) - 1 = 0.