3.1. Representation by symmetric matrices. We regard each of the two equations C1 and C2 as defining a conic in the plane. Of triangle ABC. The question is therefore finding the intersections of two conics. This is done by choosing a suitable. Combination of the two conics which degenerates into a pair of straight lines. To do this we represent, the two conics by. Symmetric 3 × 3 matrices.
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