

MCQOPTIONS
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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» C. cotαcotβ-1/cotα+cotβ | |