Then
P (−An2 + Kn + 2Ta) − QTa (eci + 1) = 0,
(15)
−LMn2 − QT (eci − 1) = 0,
(16)
L (eci − 1) − Pa (eci + 1) − 2Qleci = 0,
(17)
leading, on elimination of L, P, Q, to
| cos c = | (2 Ta + Kn − An2) (1 − Mn2l/T) − Mna2 | , |
| 2Ta + Kn − An2 + Mna2 |
(18)
Then
P (−An2 + Kn + 2Ta) − QTa (eci + 1) = 0,
(15)
−LMn2 − QT (eci − 1) = 0,
(16)
L (eci − 1) − Pa (eci + 1) − 2Qleci = 0,
(17)
leading, on elimination of L, P, Q, to
| cos c = | (2 Ta + Kn − An2) (1 − Mn2l/T) − Mna2 | , |
| 2Ta + Kn − An2 + Mna2 |
(18)