Use the addition formulas for sine and cosine to prove tan(a + b) = tan a + tan b 1 tan
Chapter 1, Problem 62(choose chapter or problem)
Use the addition formulas for sine and cosine to prove tan(a + b) = tan a + tan b 1 tan a tan b cot(a b) = cot a cot b + 1 cot b cot a
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