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Enfin par la proprieté du cercle, l'on a AP × PB=PD2, ou en termes algebriques 2ax - 'xx z = = ༢༢.; donc. ༢. √2ax - xx, & mettant cette valeur de z dans l'équation

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elle fe changera en celle-ci dy =

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a que deux indéterminées, & leurs différences.

de cette

L'on décrira ( no. 14. & 15.) par le moyen équation, la roulette BMT, dont l'intersection M avec l'Hyperbole FM réfoudra le Problême propofé.

FIN.

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