A.tan(π/2) B.tan(π/4) C.arctan(π/4) D

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问题 A.tan(π/2)B.tan(π/4)C.arctan(π/4)D.arctan(π/2)

选项 A.tan(π/2)
B.tan(π/4)
C.arctan(π/4)
D.arctan(π/2)

答案 C

解析
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