1.

cot(α + β) =

A. cotα-cotβ/1 + cotαcotβ
B. cotα+cotβ/1-cotαcotβ
C. cotαcotβ-1/cotα+cotβ
D. cotαcotβ+1/cotα+cotβ
Answer» D. cotαcotβ+1/cotα+cotβ


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