The degree of the differential equation $\left(\frac{d^2 y}{d x^2}\right)^2+\left(\frac{d y}{d x}\right)^2=x \sin \left(\frac{d^2 y}{d x}\right)$, is
Answer & explanation
Correct answer: option 4
Clearly, the given differential equation is not a polynomial in differential coefficients. So, its degree is not defined.