Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 312 стр.

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         p p          p                                                
  ρ = x + = + ρ cosα + = p + ρ cos ϕ 
         2 2          2                                                
                                                                      
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  Òº}ºÓȈËã Óº ρ =                      
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