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O' is any point in the interior of a tri...

O' is any point in the interior of a triangle ABC. `OD bot BC`, `OE bot AC` and `OF bot AB`, Show that
`OA^2 + OB^2 + OC^2 overset(~)n OD^2 overset(~)n OF^2 = AF^2 + BD^2 + CE^2`

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