Principes de la géométrie analytique. Géométrie de l'espace, par L. Painvin.

I93

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(M) XtAiL + A +fC c + D =-o
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A, LL- B,vt C, w + DI, -
A 2i-+ 3VB, t C C + -Do = o
A3t- B3v+ C t Ds =o.
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