In a equilateral traingle ABC ,D is a point on side BC such that BD=1/3 BC THEN PROVE THAT 9AD²=7AB²

In a equilateral traingle ABC ,D is a point on side BC such that BD=1/

1.	In a equilateral traingle ABC ,D is a point on side BC such that BD=1/3 BC THEN PROVE THAT 9AD²=7AB²
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