Sec
 Usage
• Sec[z] gives the secant of z.
Notes
• Mathematical function (see Section A.3.10). • The argument of Sec is assumed to be in radians. (Multiply by Degree to convert from degrees.) •  . • 1/Cos[z] is automatically converted to Sec[z]. TrigFactorList[expr] does decomposition. • New in Version 1.
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