engineering mathematics MCQ #5585

What is the value of cos(2x) if sin(x) = 3/5?

engineering mathematics MCQ #5585

  1. Question 1

    Q1. What is the value of cos(2x) if sin(x) = 3/5?

    • A) 7/25
    • B) -7/25
    • C) 24/25
    • D) -24/25

    Answer: 7/25

    Explanation: Using the double angle formula, cos(2x) = 1 - 2sin²(x) = 1 - 2(3/5)² = 7/25