[" If "a=2" ,then numbers are "14,10,6,2...

[" If "a=2" ,then numbers are "14,10,6,2" ."],[" If "d=-2" ,then numbers in A.P are "2,6,10,14" or "14,6" ,"BC" such that "BD=(1)/(3)BC" .Prov "],[" Hence,four numbers in A.P.are "ABC,D" is point on side "BC" such that "BD=(1)/(3)BC" .Prove "],[" Hence,four numbers in angle "ABC,D" is point on soint on "],[((6.)/(6.))" In an equilateral triangle "ABC,D" is point on be a point on side "BC" such that "BD=],[9AD^(2)=7AB^(2)" ."]

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In an equilateral triangle ABC,D is a point on side BC such that BD=(1)/(3)BC Prove that 9AD^(2)=7AB^(2)

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