In: Advanced Math
Find the particular integral of the following differential equations.(Explain each step clearly)
(a) d2y/dx2 + y = (x + 1) sin x. show that the answer is yp(x) = − 1/8 [ (2x2 + 4x − 1) cos x − (2x + 2) sin x ]
(Hint:In this case, we substitute sin αx or cos αx with eiαx then use the shift operator. In the case of sin αx we extract the imaginary part.)