 Hi and welcome to the session. Let us discuss the following question. Question says determine order and degree of following differential equations. Given differential equation is square of d square y upon dx square plus cos dy upon dx is equal to 0. Let us now start with the solution. First of all, let us rewrite the differential equation given in the question. It is square of d square y upon dx square plus cos dy upon dx is equal to 0. Now clearly we can see highest order derivative present in the given differential equation is d square y upon dx square. So its order is 2. So we can write the highest order derivative present in given differential equation is d square y upon dx square. So its order is 2. Now let us discuss about degree of the given differential equation. Degree of a differential equation is defined if it is a polynomial equation in its derivatives. Now clearly we can see this given differential equation is not a polynomial equation in its derivative dy upon dx. So we can write the given differential equation is not a polynomial equation in its derivatives and so its degree is not defined. So we get order of this differential equation is 2 and degree of this differential equation is not defined. So this is our required answer. This completes the session. Hope you understood the solution. Take care and keep smiling.