A.x2+cosy B.x2-cosy C.x2+cosy+1 D.x2-

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问题 A.x2+cosyB.x2-cosyC.x2+cosy+1D.x2-cosy+1

选项 A.x2+cosy
B.x2-cosy
C.x2+cosy+1
D.x2-cosy+1

答案 A

解析
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