If a + b + g = 180 and cot u = cot a + cot b + cot g, 0 6
Chapter 7, Problem 108(choose chapter or problem)
If a + b + g = 180 and cot u = cot a + cot b + cot g, 0 6 u 6 90 show that sin3 u = sin1a - u2 sin1b - u2 sin1g - u2
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