Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 278 стр.

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                                                                                             1
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                  ~ÈäˈÒä           ˆÈ}ÎË              ˆº             º¹Ë¯Èˆº¯               Q + Q                          ª¯ä҈ºm                 Ò           ˆº
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                                          = ( A − A ) 2 + τ 2 ( B − B ) 2 +
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                                          + τ ( ( A − A )( B − B ) − ( B − B )( A − A ) )i =
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                                          = ( A − A ) 2 + τ 2 ( B − B ) 2 + τ ( AB
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                                                      a                    a            a
                                                                                                                                               
                                                           = τ 2 B − τ C + A
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                                                                                                                                                                    2
                          ( C a ) 2 −   4 A B ≤ 0 ÒãÒº}ºÓȈËã Óº A B                                                 ≥
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