engineering mathematics MCQ #5549

If sin(x) = 3/5, then what is the value of cos(2x)?

engineering mathematics MCQ #5549

  1. Question 1

    Q1. If sin(x) = 3/5, then what is the value of cos(2x)?

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

    Answer: 7/25

    Explanation: cos(2x) = 1 - 2sin²x = 1 - 2(9/25) = 7/25 when sin x = 3/5.