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A direct method of obtaining the Foci and Directrices from the general equation 
Published online by Cambridge University Press: 20 January 2009
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The general equation of the second degree in two variables
can be brought by a direct process into the form
the determination of the constants ξ η l, m, n depending only on the solution of quadratic equations; so that the method is suitable for determining the foci, directrices, and eccentricities of conies with given numerical equations.
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- Copyright © Edinburgh Mathematical Society 1904
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