Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 305 стр.

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                                         x → ±∞   a         a                             a x → ±∞
                                                                                                                                        
                                      b       ( x 2 − a2 ) − x 2                                                  1
                                    =     lim                                =          − ab lim                           =       0.
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