Cot
 Usage
• Cot[z] 给出了z的余切。
Notes
• Cot的参数假设是弧度。(乘以 Degree 从度数转换.) •  . • Cos[z]/Sin[z] 自动转换为Cot[z]. TrigFactorList[expr] 进行分解。
 Further Examples
This is the derivative.
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This is the indefinite integral.
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This is a series expansion around 
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