Sqrt
 Usage
• Sqrt[z] 或  返回 z 的根.
Notes
• Sqrt[z] 被转换为 z^(1/2). • Sqrt[z^2] 不自动被转换为 z. • Sqrt[a b] 不自动被转换为 Sqrt[a] Sqrt[b]. • 这些转换可使用PowerExpand实现,但通常只对实参数进行校正. • 在 StandardForm中, Sqrt[z] 被输出为  . •  z 可被用作输入.  字符输入为  sqrt 或 \ [Sqrt].
 Further Examples
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Sqrt will return a complex result when evaluating a negative argument.
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This result is false if a and b are both negative, but you can do it anyway with PowerExpand.
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This is the derivative.
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This is the integral.
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This is a series expansion around  .
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可使用 
