1.

tan(α + β) =

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


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