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

题库2022-08-02  27

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

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

答案 C

解析
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