3. to find p.i., when q is of the form xm in this case p.l. edx". working rule take out the lowest degree term from f(d) and the remaining factor will be of the

3. To find P.I., when Q is of the form xm In this case P.l. EDX". Working Rule Take out the lowest degree term from F(D) and the remaining factor will be of the form [1 +f(D)] or [1-f(D)] and this factor can be taken in the numerator with a negative index which can be expanded with the help of Binomial Theorem. The expansion is to be carried upto the term D", since Dm 1xm = 0, Dm 2xm = 0 and all other higher differential coefficients of xm are zero. Can anyone explain this.