Question

Find the order of the differential equation –\(\left (\frac{3d^2 y}{dx^2}\right )+cos⁡(y”)=0\)

(a) 4

(b) 1

(c) 3

(d) 2

This question was posed to me in an interview for internship.

Asked question is from Differential Equations Basics-2 in division Differential Equations of Mathematics – Class 12

Answer 1

The correct choice is (d) 2

The best explanation: The highest order derivative in the given differential equation is \(\frac{d^2 y}{dx^2}\). Therefore, the order of the differential equation is 2.