If in Traingle ABC, AD is median and AM perpendicular to BC, then prove that AB2+AC2= 2AD2+1/2BC2

If in Traingle ABC, AD is median and AM perpendicular to BC, then prov

1.	If in Traingle ABC, AD is median and AM perpendicular to BC, then prove that AB2+AC2= 2AD2+1/2BC2
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