engineering mathematics MCQ #4917

The general solution of cos(x) + cos(3x) + cos(5x) = 0 is

engineering mathematics MCQ #4917

  1. Question 1

    Q1. The general solution of cos(x) + cos(3x) + cos(5x) = 0 is

    • A) nπ/3 + π/6
    • B) (2n + 1)π/6
    • C) nπ/3 or (2n + 1)π/2
    • D) nπ

    Answer: nπ/3 or (2n + 1)π/2

    Explanation: Using sum-to-product identities, we simplify the equation, which gives solutions nπ/3 and (2n + 1)π/2.