engineering mathematics MCQ #693

If y = cos(2x), then dy/dx = ?

engineering mathematics MCQ #693

  1. Question 1

    Q1. If y = cos(2x), then dy/dx = ?

    • A) -2sin(2x)
    • B) 2sin(2x)
    • C) -sin(2x)
    • D) sin(2x)

    Answer: -2sin(2x)

    Explanation: Using the chain rule, if y = cos(u), then dy/dx = -sin(u)(du/dx), so dy/dx = -sin(2x) * 2 = -2sin(2x).