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Published online by Cambridge University Press: 03 November 2016
1. The foci, directrices and the eccentricity of the conic given by the general equation of the second degree can be determined by the use of the fundamental property of the conic, that SP = e . PM. Let the equation be
ax2 + 2hxy + by2 + 2gx + 2fy + c = 0.