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In Fig.6.45,O is a point in the interior...

In Fig.6.45,O is a point in the interior of a triangle ABC,`OD_|_BC,OE_|_AC and OF_|_AB`.Show that
(i)`OA^2+OB^2+OC^2-OD^2-OE^2-OF^2=AF^2+BD^2+CE^2`

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Fig.6.45,O is a point in the interior of a triangle ABC, OD_|_BC,OE_|_AC and OF_|_AB .Show that (ii) AF^2+BD^2+CE^2=AE^2+CD^2+BF^2

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