The perpendicular AD on the base BC of a triangle ABC intersects BC at D so that DB = 3 CD. Which one of the following is correct ?
2(AB + AC)(AB -AC) = BC²
3(AB + AC)(AB - AC) = 2BС²
4(AB + AC)(AB - AC) = 3BС²
5(AB + AC)(AB - AC) = 4BС²
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