1.

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

Answer»

Which of the following are correct?

(1) cot(A+B) = cotAcotB1cotA+cotB

(2) cot(A-B) = cotAcotB1cotAcotB

(3) tan(A+B) = tanA+tanB1tanAtanB

(4) tan(A-B) = tanAtanB1tanAtanB




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