A.-π/(4+π) B.π/(π-4) C.π/(4+π) D.π/(4

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问题 A.-π/(4+π)B.π/(π-4)C.π/(4+π)D.π/(4-π)

选项 A.-π/(4+π)
B.π/(π-4)
C.π/(4+π)
D.π/(4-π)

答案 D

解析
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