engineering mathematics MCQ #834

If y = cos(3x), then dy/dx =

engineering mathematics MCQ #834

  1. Question 1

    Q1. If y = cos(3x), then dy/dx =

    • A) -3sin(3x)
    • B) 3cos(3x)
    • C) -sin(3x)
    • D) 3sin(3x)

    Answer: -3sin(3x)

    Explanation: Using the chain rule, the derivative of cos(3x) is -sin(3x) * d(3x)/dx = -3sin(3x).