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Indfores « og ^ i (33 a), antager denne Ligning Formen<br />

(33 c) _^2_(i_^2)(^-2_^2),<br />

der altsaa bliver den faelles Ligning for Ellipse og Hyperbel<br />

i det ny Koordinatsystem; (33c) viser umiddelbart, at begge<br />

Koordinataxer nu er Symmetriaxer for disse Kurver.<br />

For at finde Koordinaterne til det i § 25 forekommende<br />

Braendpunkt F og Ligningen for den tilsvarende Ledelinie /,<br />

bemaerker vi, at (25 a) i Forbindelse med (33 b) giver<br />

ek ^=- +

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