 Hello and welcome to the session. Let us discuss the following question. Question says, for each of the differential equations given below, indicate its order and degree. d4y upon dx4 minus sin d cubed y upon dx cubed is equal to 0. Let us now start with the solution. Now given differential equation is d4y upon dx4 minus sin d cubed y upon dx cubed is equal to 0. First of all, we will find out order of this differential equation. We know order of a differential equation is the order of the highest order derivative occurring in the differential equation. Similarly, we can see here highest order derivative occurring in this equation is d4y upon dx4 that is fourth derivative of y. So, order of this differential equation is 4. Now we can write the highest order derivative present in the given differential equation is d4y upon dx4. Its order is 4. Now we will discuss about degree of this differential equation. Now we know degree of a differential equation is defined if it is a polynomial equation in its derivatives. Clearly we can see here differential equation is not a polynomial equation in d cubed y upon dx cubed. So, degree of the given differential equation is not defined. Now we can write the given differential equation is not a polynomial equation in its derivatives. And so its degree is not defined. Now our required answer is order of the given differential equation is 4 and degree of the given differential equation is not defined. This completes the session. Hope you understood the solution. Take care and have a nice day.