《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: 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. 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.
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