 Hi and welcome to the session. Today I am going to help you with the following question. Question says determine the order and degree of following differential equations. First part is fourth derivative of y with respect to x plus sin third derivative of y with respect to x is equal to 0. Let us now start with the solution. Now we are given with differential equation fourth derivative of y with respect to x plus sin y triple dash is equal to 0. First of all let us define order of a differential equation. Order of a differential equation is the order of the highest order derivative occurring in the differential equation. Now the highest order derivative present in the given differential equation is fourth derivative of y with respect to x. So order of this differential equation is 4. So we can write the highest order derivative present in the differential equation is fourth derivative of y with respect to x. So its order is 4. Now let us understand how we can find out degree of a differential equation. To study the degree of a differential equation the key point is that the differential equation must be a polynomial equation in derivatives y dash, y double dash, y triple dash etc. Now clearly we can see this given differential equation is not a polynomial equation in fourth derivative of y with respect to x and degree of such a differential equation cannot be defined. So we can write the given differential equation is not a polynomial equation in its derivative and so its degree is not defined. So this is our required answer. This completes the session. Hope you understood the solution. Take care and keep smiling.