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Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 213
Fig. 98. … Cii. XV, § 1U2] HIGHER PLANE CURVES 197 Then FP = V(a; - of + f, aiid FT = V(a, + cf + /•But FPFF=r.m. Hence [(.r - ^)2 + /] [(x- + ^j^ + /-] = ^»S or (^2 + ?/2 ^ ^.2j2 _ 4 ^2^.2^ ^^4 is the equation of the Cassinian ovaL The intercepts of the curve on the axes are ± Vc- ± m^and ± Vm^ — c^. Hence…Geometry, Analytic
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