Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 86 стр.

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}ºÓÒË°}º® ¹ºm˯²Óº°ˆÒ ÒÏ ¯Ò°  NM = θ ( r0 − F (ϕ ))  Ò °ã˺mȈËã Óº ‚¯ÈmÓËÓÒË
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                                                   r (ϕ , θ ) = (1 − θ ) F (ϕ ) + θ r0 ,
                                                                                         
                                                   ϕ ∈ Ω , θ ∈ ( −∞,+∞) .
       
{}ºº¯ÒÓȈӺ®Áº¯ä˹º°ãËÒ°}ã ËÓÒ«θ¹ºã‚ÈËä

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                                            x 0 − Fx (ϕ ) y 0 − Fy (ϕ ) z 0 − Fz (ϕ )
            
            
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                                                     x − 3 cosϕ y − 3 sin ϕ    z
                                                               =            =    , ϕ ∈[0,2π ) 
                                                      − 3 cosϕ   − 3 sin ϕ    −1
            
            ~ÈäˈÒ䈺˰ãÒÒϹºã‚ËÓÓ©²°ººˆÓº ËÓÒ®Ò°}ã ҈ ˆÈ}ÎËҹȯÈäˈ¯ ϕ
                                                  x2 y2
ˆº¹ºã‚҈°«‚¯ÈmÓËÓÒËmÒÈ                        +   − ( z + 1) 2 = 0 ˆºË°ˆ  N = 2 .
                                                  9   9
            
            

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