Use the addition formulas for sine and cosine to prove tan(a + b) = cot(a - b)
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Use the addition formulas for sine and cosine to prove
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tan(a + b) = cot(a - b) tan a + tan b 1 - tan a tan b cota cotb + 1 cot b - cot a
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tana b cot a b sina b cosa b cosa b sina b sin a cos b cos a sin b cos a cos b ...View the full answer
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