由题意, f (x) f (x) 二阶可导,则易知 f (x) ∈ c [ − π 2, π 2]. 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、经验和见解,找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区. 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 的定义域是所有不等于 (kπ + π/2) 的实数,其中 k 是整数。 这是因为当 x.
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《汉语拼音方案》里的 y和 w 纯粹是个隔音符号,在声韵调系统中,y 和 w不能看作声母。y和 w的使用规则其实非常简易:
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