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Given 13 b a 12 a c 11 c b + = + = + for a Δ ABC with usual notation. If γ = β = α C cos B cos A cos , then the ordered triad ( α , β , γ ) has a value

1. (19, 7, 25)
2. (7, 19, 25)
3. (5, 12, 13)
4. (3, 4, 5)

Correct answer: (19, 7, 25)

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