How To Do Method Of Undetermined Coefficients. Method of undetermined coefficients is used for finding a general formula for a specific summation problem. I have already found the solution to y''+9y=0 is c1(cos3t)+c2(sin3t).
I have already found the solution to y''+9y=0 is c1(cos3t)+c2(sin3t). Remember that we only use this method when the left side of the de has constant coe cients and the right. Method of undetermined coe cients:
