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OpenStudy (anonymous):
If in triangle ABC, AB = 12, AC = 14 and BC = 16, then cos of angle A = (A) 6/7 (B) 11/16 (C) 7/8 (D) 1/4 (E) 3/4
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OpenStudy (anonymous):
use a2=b2+c2-2bc cosA
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