Arctangent（即arctan）指反正切函数，反正切函数是反三角函数的一种，即正切函数的反函数。一般大学高等数学中有涉及。
专业释义英英释义
arctan
- n. the inverse function of the tangent; the angle that has a tangent equal to a given number
以上来源于: WordNet
柯林斯英汉双解大词典
arctan /ˈɑːkˌtæn/
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1.
ABBREVIATION for arctangent: the function the value of which for a given argument is the angle in radians (between –π/2 and π/2) the tangent of which is that argument: the inverse of the tangent function 反正切
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