Sec
 Usage
• Sec[z] 给出z的正割.
Notes
• Sec的参数以弧度(由Degree乘度数转换而来)为单位. •  . • 1/Cos[z] 自动转换为 Sec[z]. TrigFactorList[expr] 进行分解.
 Further Examples
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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