Tan[x] >= x /; Inequality[0, LessEqual, x, Less, Pi/2] && Element[x, 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> <mi> tan </mi> <mo> &#8289; </mo> <mo> ( </mo> <mi> x </mi> <mo> ) </mo> </mrow> <mo> &#8805; </mo> <mi> x </mi> </mrow> <mo> /; </mo> <mrow> <mrow> <mn> 0 </mn> <mo> &#8804; </mo> <mi> x </mi> <mo> &lt; </mo> <mfrac> <mi> &#960; </mi> <mn> 2 </mn> </mfrac> </mrow> <mo> &#8743; </mo> <mrow> <mi> x </mi> <mo> &#8712; </mo> <semantics> <mi> &#8477; </mi> <annotation encoding='Mathematica'> TagBox[&quot;\[DoubleStruckCapitalR]&quot;, Function[Reals]] </annotation> </semantics> </mrow> </mrow> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <ci> Condition </ci> <apply> <geq /> <apply> <tan /> <ci> x </ci> </apply> <ci> x </ci> </apply> <apply> <and /> <apply> <ci> Inequality </ci> <cn type='integer'> 0 </cn> <leq /> <ci> x </ci> <lt /> <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> </apply> </annotation-xml> </semantics> </math>

Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Tan", "[", "x", "]"]], "\[GreaterEqual]", "x"]], "/;", RowBox[List[RowBox[List["0", "\[LessEqual]", "x", "<", FractionBox["\[Pi]", "2"]]], "&&", RowBox[List["x", "\[Element]", "Reals"]]]]]]]]

2001-10-29