The degree of differential equation $\frac{d^2 y}{d x^2}+3\left(\frac{d y}{d x}\right)^2=x \log \frac{d^2 y}{d x^2}$ is :

1 2 3 none of these

none of these

Since the equation is not a polynomial in all the differential coefficient so the degree of equation is not defined. Hence (4) is the correct answer.