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问题详情:

                                                 (     ...                                                  (       )

 A.                                                 (     ... 第2张            B.                                                 (     ... 第3张       C.                                                 (     ... 第4张           D.                                                 (     ... 第5张     

【回答】

D

知识点:三角函数

题型:选择题

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