“arc tangent”的概念、定义、翻译、参考文献-科学参考

单词	arc tangent
释义	arc tangent [¦ärk `tan·jǝnt] ^MATHEMATICS 1. For a number x, any angle whose tangent equals x. 2. For a number x, the angle between -π/2 radians and π/2 radians whose tangent equals x; it is the value at x of the inverse of the restriction of the tangent function to the interval between -π/2 and π/2.
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