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Which of the following are correct? (1) cot(A+B) = cotAcotB−1cotA+cotB (2) cot(A-B) = cotAcotB−1cotA−cotB (3) tan(A+B) = tanA+tanB1−tanAtanB (4) tan(A-B) = tanA−tanB1−tanAtanB |
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Answer» Which of the following are correct? (1) cot(A+B) = cotAcotB−1cotA+cotB (2) cot(A-B) = cotAcotB−1cotA−cotB (3) tan(A+B) = tanA+tanB1−tanAtanB (4) tan(A-B) = tanA−tanB1−tanAtanB |
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