engineering mathematics MCQ #798

If y = sin(x) + cos(x), then d²y/dx² at x = 0 = ?

engineering mathematics MCQ #798

  1. Question 1

    Q1. If y = sin(x) + cos(x), then d²y/dx² at x = 0 = ?

    • A) -1
    • B) 1
    • C) 0
    • D) 2

    Answer: -1

    Explanation: First derivative is cos(x) - sin(x), and the second derivative is -sin(x) - cos(x). At x = 0, -sin(0) - cos(0) = -1.