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P. 53

(   ) x     f  (x   )         (x   )









                                                x         x                                         x         x
                                                              0                                                    0







                                                                   A                      A



                                                                               A












                                             lim      (    x )       A

                                             x   x 0                           lim             f (  x )       A
                                             lim     (     x )       A               x   x 0


                                             x   x 0
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