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k
                     6 .For g(x) = cos(λx)  n    A k x , the solution has the form
                      ◦
                                        k=0
                                                    n                n
                                                          k               k
                                       y(x) = cos(λx)  B k x + sin(λx)  C k x ,
                                                    k=0             k=0
                     where the constants B k and C k are found by the method of undetermined coefficients.
                                              k
                     7 .For g(x) = sin(λx)  n    A k x , the solution has the form
                      ◦
                                       k=0
                                                    n                n
                                                          k               k
                                       y(x) = cos(λx)  B k x + sin(λx)  C k x ,
                                                    k=0             k=0
                     where the constants B k and C k are found by the method of undetermined coefficients.

                      ◦
                     8 .For g(x)= e µx  n    A k cos(λ k x), the solution has the form
                                    k=1
                                               n                 n
                                     y(x)= e µx     B k cos(λ k x)+ e µx     C k sin(λ k x),
                                              k=1                k=1
                     where the constants B k and C k are found by the method of undetermined coefficients.

                      ◦
                     9 .For g(x)= e µx  n    A k sin(λ k x), the solution has the form
                                    k=1
                                               n                 n
                                     y(x)= e µx     B k cos(λ k x)+ e µx     C k sin(λ k x),
                                              k=1                k=1
                     where the constants B k and C k are found by the method of undetermined coefficients.
                       ◦
                     10 .For g(x) = cos(λx)  n    A k exp(µ k x), the solution has the form
                                         k=1
                                               n                    n

                                 y(x) = cos(λx)  B k exp(µ k x) + sin(λx)  B k exp(µ k x),
                                              k=1                   k=1
                     where the constants B k and C k are found by the method of undetermined coefficients.

                     11 .For g(x) = sin(λx)  n    A k exp(µ k x), the solution has the form
                       ◦
                                        k=1
                                               n                    n

                                 y(x) = cos(λx)  B k exp(µ k x) + sin(λx)  B k exp(µ k x),
                                              k=1                   k=1
                     where the constants B k and C k are found by the method of undetermined coefficients.

                         b
               39.      f(t)y(x + βt) dt = Ax + B.
                      a
                     Solution:
                                                    y(x)= px + q,
                     where
                                  A       B   AI 1 β           b              b
                              p =   ,  q =   –   2  ,   I 0 =  f(t) dt,  I 1 =  tf(t) dt.
                                  I 0     I 0   I            a              a
                                                 0



                 © 1998 by CRC Press LLC









               © 1998 by CRC Press LLC
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