integration bug?



Hi

please take a look at the following code snippet.
The first integration result is right, but not the second one.

                                                         b + a x
(%i2)                        INTEGRATE( - - - - - - -, x)
                                                         d + c x
                        a x   (a d - b c) LOG(c x + d)
(%o2)                   --- - ------------------------
                         c                2
                                         c
(%i3)               EV(%, a = 1, b = F10, c = - 1, d = F10)
(%o3)                      - x - 2 F10 LOG(F10 - x)
                                                        x + F10
(%i4)                        INTEGRATE(- - - - - - - , x)
                                                         F10 - x
(%o4)                      - 2 F10 LOG(x - F10) - x

May be I am overlooking some details or is it simple an error?

Klaus