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The perpendicular from A on side BC of a...

The perpendicular from A on side BC of a `Delta`ABC meets BC at D such that DB = 3CD. Prove that `2AB^2 = 2AC^2 + BC^2`

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The perpendicular from A on side BC of a DeltaABC meets BC at D such that DB = 3CD .Prove that 2AB^(2)=2AC^(2)+BC^(2) .

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