If in a ΔABC,AD is median and AM is perpendicular to BC ,then prove that AB^2+AC^2=2AD^2+1/2BC^2

If in a ΔABC,AD is median and AM is perpendicular to BC ,then prove t

1.	If in a ΔABC,AD is median and AM is perpendicular to BC ,then prove that AB^2+AC^2=2AD^2+1/2BC^2
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