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lim f          (x   )       f  (x     )

                                                              x   x   0                            0
                                                                     0







                                                               lim f          (x   )       f  (x     )

                                                             x    x   0                           0
                                                                    0








                                                  lim f         (x   )        lim f          (x   )       f  (x     )                     (26)

                                                x   x   0                  x    x   0                           0
                                                                                    0
                                                      0










                         lim f         (x   )  f       (x            ) 0                     lim f         (x   )  f       (x   0        ) 0

                       x x     0                           0                               x x  0  0
                             0
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