我们要找出函数 y = tanx 的定义域和值域。 首先,我们需要了解正切函数(tanx)的基本性质。 正切函数 y = tanx 的. 知乎,中文互联网高质量的问答社区和创作者聚集的原创内容平台,于 2011 年 1 月正式上线,以「让人们更好的分享知识、经验和见. 就像人民币的简写到底是 rmb 还是 cny 一样,关于人民币货币符号是 y 加一横还是两横也一直有各种争论,而且没有定论。(以.
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由题意, f (x) f (x) 二阶可导,则易知 f (x) ∈ c [ − π 2, π 2].
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