In a triangle ABC, AD is a median and AE perpendicular to base BC.PROVE THAT AB^2+AC^2=2AD^2+1÷2BC^2

In a triangle ABC, AD is a median and AE perpendicular to base BC.PROV

1.	In a triangle ABC, AD is a median and AE perpendicular to base BC.PROVE THAT AB^2+AC^2=2AD^2+1÷2BC^2
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