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   http://functions.wolfram.com/01.16.29.0001.01
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    Abs[ArcCot[x]] <= Pi/2 /; Element[x, Reals] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Abs", "[", RowBox[List["ArcCot", "[", "x", "]"]], "]"]], "\[LessEqual]", FractionBox["\[Pi]", "2"]]], "/;", RowBox[List["x", "\[Element]", "Reals"]]]]]] 
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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>  <mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[LeftBracketingBar]" </annotation>  </semantics>  <mrow>  <msup>  <mi> cot </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mi> x </mi>  <mo> ) </mo>  </mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[RightBracketingBar]" </annotation>  </semantics>  </mrow>  <mo> ≤ </mo>  <mfrac>  <mi> π </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> /; </mo>  <mrow>  <mi> x </mi>  <mo> ∈ </mo>  <semantics>  <mi> ℝ </mi>  <annotation encoding='Mathematica'> TagBox["\[DoubleStruckCapitalR]", Function[Reals]] </annotation>  </semantics>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <leq />  <apply>  <abs />  <apply>  <arccot />  <ci> x </ci>  </apply>  </apply>  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <in />  <ci> x </ci>  <reals />  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Abs", "[", RowBox[List["ArcCot", "[", "x", "]"]], "]"]], "\[LessEqual]", FractionBox["\[Pi]", "2"]]], "/;", RowBox[List["x", "\[Element]", "Reals"]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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