反正切级数的英文：
inverse tangent series

inverse是什么意思：
n. 相反；倒转
adj. 相反的；逆向的；倒转的
  • The value of a fraction is inversely proportional to that of the denominator
    分数值与分母值成反比例。
  • The recorder trace is a series of inverse peaks.
    记录器扫迹是一系列相反的波峰。
  • The value of a fraction is inversely proportional to that of the denominator.
    分数值与分母值成反比例。
tangent是什么意思：
n. 正切；直线区间；突兀的转向；突然转移话题
  • The direction is tangent to the trajectory.
    方向就是轨道的切线方向。
  • The tangent is a relatively important concept in trigonometry.
  • The graph of a concave function is always below its tangent.
    一个凹函数的图象总在它的切线的下方。
series是什么意思：
n. 系列，连续；系列节目；系列比赛；丛书；串联；级数
  • There was a series of explosions.
    有一连串的爆炸事件。
  • A series of tilting matches; a tournament.
    比武一系列持矛的比武；马上比武
  • A series of accidents disordered the shop.
    一连串的意外事件把店里弄得乱七八糟。

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