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[" 13.In an isosceles triangle "ABC,AB=A...

[" 13.In an isosceles triangle "ABC,AB=AC" .Also "BD" is perpendicular from "B" to the side "AC" .Pro "],[" that "BD^(2)-CD^(2)=2CD*AD" ."]

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In an isosceles triangle ABC with AB=ACBD is perpendicular from B to the side AC. Prove that BD^(2)-CD^(2)=2CDAD

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