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   http://functions.wolfram.com/01.26.27.1462.01
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    ArcCosh[a (b z^c)^m] == (Sqrt[a (b z^c)^m - 1]/Sqrt[1 - a (b z^c)^m]) 
   (Pi/2 + ((I (b z^c)^m)/(b^m z^(m c))) ArcSinh[I a b^m z^(m c)]) /; 
 Element[2 m, Integers] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["ArcCosh", "[", RowBox[List["a", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"]]], "]"]], "\[Equal]", RowBox[List[FractionBox[SqrtBox[RowBox[List[RowBox[List["a", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"]]], "-", "1"]]], SqrtBox[RowBox[List["1", "-", RowBox[List["a", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"]]]]]]], RowBox[List["(", RowBox[List[FractionBox["\[Pi]", "2"], "+", RowBox[List[FractionBox[RowBox[List["\[ImaginaryI]", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"], " "]], RowBox[List[SuperscriptBox["b", "m"], " ", SuperscriptBox["z", RowBox[List["m", " ", "c"]]]]]], RowBox[List["ArcSinh", "[", RowBox[List["\[ImaginaryI]", " ", "a", " ", SuperscriptBox["b", "m"], " ", SuperscriptBox["z", RowBox[List["m", " ", "c"]]]]], "]"]]]]]], ")"]]]]]], "/;", RowBox[List[RowBox[List["2", " ", "m"]], "\[Element]", "Integers"]]]]]] 
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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>  <msup>  <mi> cosh </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> b </mi>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mi> c </mi>  </msup>  </mrow>  <mo> ) </mo>  </mrow>  <mi> m </mi>  </msup>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <msqrt>  <mrow>  <mrow>  <mi> a </mi>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> b </mi>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mi> c </mi>  </msup>  </mrow>  <mo> ) </mo>  </mrow>  <mi> m </mi>  </msup>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msqrt>  <msqrt>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mi> a </mi>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> b </mi>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mi> c </mi>  </msup>  </mrow>  <mo> ) </mo>  </mrow>  <mi> m </mi>  </msup>  </mrow>  </mrow>  </msqrt>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mfrac>  <mi> π </mi>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mrow>  <mfrac>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> b </mi>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mi> c </mi>  </msup>  </mrow>  <mo> ) </mo>  </mrow>  <mi> m </mi>  </msup>  </mrow>  <mrow>  <msup>  <mi> b </mi>  <mi> m </mi>  </msup>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mrow>  <mi> m </mi>  <mo> ⁢ </mo>  <mi> c </mi>  </mrow>  </msup>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <msup>  <mi> sinh </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> a </mi>  <mo> ⁢ </mo>  <msup>  <mi> b </mi>  <mi> m </mi>  </msup>  <mo> ⁢ </mo>  <msup>  <mi> z </mi>  <mrow>  <mi> m </mi>  <mo> ⁢ </mo>  <mi> c </mi>  </mrow>  </msup>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> m </mi>  </mrow>  <mo> ∈ </mo>  <semantics>  <mi> ℤ </mi>  <annotation encoding='Mathematica'> TagBox["\[DoubleStruckCapitalZ]", Function[Integers]] </annotation>  </semantics>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <arccosh />  <apply>  <times />  <ci> a </ci>  <apply>  <power />  <apply>  <times />  <ci> b </ci>  <apply>  <power />  <ci> z </ci>  <ci> c </ci>  </apply>  </apply>  <ci> m </ci>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <apply>  <power />  <apply>  <plus />  <apply>  <times />  <ci> a </ci>  <apply>  <power />  <apply>  <times />  <ci> b </ci>  <apply>  <power />  <ci> z </ci>  <ci> c </ci>  </apply>  </apply>  <ci> m </ci>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <apply>  <power />  <apply>  <power />  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <ci> a </ci>  <apply>  <power />  <apply>  <times />  <ci> b </ci>  <apply>  <power />  <ci> z </ci>  <ci> c </ci>  </apply>  </apply>  <ci> m </ci>  </apply>  </apply>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <plus />  <apply>  <times />  <pi />  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <imaginaryi />  <apply>  <power />  <apply>  <times />  <ci> b </ci>  <apply>  <power />  <ci> z </ci>  <ci> c </ci>  </apply>  </apply>  <ci> m </ci>  </apply>  <apply>  <power />  <apply>  <times />  <apply>  <power />  <ci> b </ci>  <ci> m </ci>  </apply>  <apply>  <power />  <ci> z </ci>  <apply>  <times />  <ci> m </ci>  <ci> c </ci>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <arcsinh />  <apply>  <times />  <imaginaryi />  <ci> a </ci>  <apply>  <power />  <ci> b </ci>  <ci> m </ci>  </apply>  <apply>  <power />  <ci> z </ci>  <apply>  <times />  <ci> m </ci>  <ci> c </ci>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  <apply>  <in />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> m </ci>  </apply>  <integers />  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["ArcCosh", "[", RowBox[List["a_", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b_", " ", SuperscriptBox["z_", "c_"]]], ")"]], "m_"]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[SqrtBox[RowBox[List[RowBox[List["a", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"]]], "-", "1"]]], " ", RowBox[List["(", RowBox[List[FractionBox["\[Pi]", "2"], "+", FractionBox[RowBox[List[RowBox[List["(", RowBox[List["\[ImaginaryI]", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"]]], ")"]], " ", RowBox[List["ArcSinh", "[", RowBox[List["\[ImaginaryI]", " ", "a", " ", SuperscriptBox["b", "m"], " ", SuperscriptBox["z", RowBox[List["m", " ", "c"]]]]], "]"]]]], RowBox[List[SuperscriptBox["b", "m"], " ", SuperscriptBox["z", RowBox[List["m", " ", "c"]]]]]]]], ")"]]]], SqrtBox[RowBox[List["1", "-", RowBox[List["a", " ", SuperscriptBox[RowBox[List["(", RowBox[List["b", " ", SuperscriptBox["z", "c"]]], ")"]], "m"]]]]]]], "/;", RowBox[List[RowBox[List["2", " ", "m"]], "\[Element]", "Integers"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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