Explanation:
(D) : Here the given differential equation can be written as
\(\left(\frac{d^{2} y}{d x^{2}}\right)^{4}=\left\{y+\left(\frac{d y}{d x}\right)^{2}\right\}\)
Clearly, its order and degree are 2 and 4 respectively.
B. Integrating Factor, Solution and Formation of differential Equation (General, particular and separation of variable)