“`” 参考回答：
定义域为<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552619092213_171B20A604B88BE2CC570EF936359F57"">
值域为(0,1)
函数在定义域内为连续和光滑的函数
处处可导,导数为<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552619110289_2FC0EF550E43398C033CAF8AE5CD23F6"">
<pre><code> "“`
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