8. In Fig. 6.54, O is a point in the interior of a triangle
ABC,OD IBC, OE 1AC and OF LAB. Show that
(i) OA 2+ OB2+OC2-OD2-OE-OF2 = AF2 + BD2 + CE?,
(ii) AF2 + BD2+ CE2 = AE? + CD + BF2.
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