-=(  )A.4        B.2        C.-2           D.-4

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问题详情:

  -=(  )A.4        B.2        C.-2           D.-4- -=(  )A.4        B.2        C.-2           D.-4 第2张= (  )

A.4         B.2         C.-2            D.-4

【回答】

D

知识点:三角恒等变换

题型:选择题

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