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  "text": "constructionem) est ergo \\( K_e \\) æqualis \\( KA \\); unde est punctum \\( K \\) ad parabolam foco \\( A \\) & vertice principali \\( C \\) descriptam. \\( Q.E.D. \\)\n\nBifecto autem angulo \\( AKE \\) à rectâ \\( KB \\), tanget hæc utramq; parabolam, tam foco \\( F \\) per \\( A \\) & \\( K \\), quam foco \\( A \\) per \\( K \\) descriptam. Unde se mutuo tangunt parabolæ. \\( Q.E.D. \\)\n\nErrat. Pag. 152. l. ult. pro \\( \\beta c. \\) l. \\( B b. \\)\n\nFINIS.\n\nLONDON:\nPrinted for W. and J. Innys. Printers to the Royall Society; at the Sign of the Prince's Arms, End of St. Paul's-Church-Tard.",
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