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Let A, B, C be angles of a triangle ABC and let D=(5pi+A)/(32), E=(5pi+B)/(32), F=(5pi+C)/(32), then : (where D, E, F ne (n pi)/(2), n in I, I denote set of integers) |
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Answer» `cotD cotE+cotEcotF+cotDcotF=1` |
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