If Q, P be the points of contact of the common tangent, and A, a the points in which the tangent is cut by the third conic, then, by Art. 206, P, Q are the foci of an involution of which A and a are conjugate points. .ac. by Art. 201, QAPa is harmonic.

Title | : | Solutions of examples and problems in conic sections |

Author | : | William Henry Besant |

Publisher | : | - 1901 |

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