engineering mathematics MCQ #4955

If cos(2x) + 2cos(x) + 1 = 0, then x =

engineering mathematics MCQ #4955

  1. Question 1

    Q1. If cos(2x) + 2cos(x) + 1 = 0, then x =

    • A) (2n + 1)π
    • B) 2nπ
    • C) (2n + 1)π/2
    • D) nπ

    Answer: (2n + 1)π

    Explanation: The equation simplifies to (cos(x) + 1)² = 0, so cos(x) = -1, giving x = (2n + 1)π.