engineering mathematics MCQ #5534

Simplify: cos²(x) - sin²(x)

engineering mathematics MCQ #5534

  1. Question 1

    Q1. Simplify: cos²(x) - sin²(x)

    • A) cos(2x)
    • B) sin(2x)
    • C) 1
    • D) tan(2x)

    Answer: cos(2x)

    Explanation: Using the double-angle identity cos(2x) = cos²(x) - sin²(x), the expression simplifies to cos(2x).