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 | | http://functions.wolfram.com/01.18.03.0029.01 | 
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 | | ArcSec[-Infinity] == Pi/2 | 
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 | | Cell[BoxData[RowBox[List[RowBox[List["ArcSec", "[", RowBox[List["-", "\[Infinity]"]], "]"]], "\[Equal]", FractionBox["\[Pi]", "2"]]]]] | 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <mrow>  <msup>  <mi> sec </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mi> ∞ </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mfrac>  <mi> π </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <arcsec />  <apply>  <times />  <cn type='integer'> -1 </cn>  <infinity />  </apply>  </apply>  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
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 | | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["ArcSec", "[", RowBox[List["-", "\[Infinity]"]], "]"]], "]"]], "\[RuleDelayed]", FractionBox["\[Pi]", "2"]]]]] | 
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 | | Date Added to functions.wolfram.com (modification date) | 
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