A.cos(x+y) B.-cos(x+y) C.sin(x+y) D.-

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问题 A.cos(x+y)B.-cos(x+y)C.sin(x+y)D.-sin(x+y)

选项 A.cos(x+y)
B.-cos(x+y)
C.sin(x+y)
D.-sin(x+y)

答案 B

解析
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