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 Tanh

 http://functions.wolfram.com/01.21.16.0050.01

 Input Form

 Tanh[z]^3 == (Sinh[3 z] - 3 Sinh[z])/(3 Cosh[z] + Cosh[3 z])

 Standard Form

 Cell[BoxData[RowBox[List[SuperscriptBox[RowBox[List["Tanh", "[", "z", "]"]], "3"], "\[Equal]", FractionBox[RowBox[List[RowBox[List["Sinh", "[", RowBox[List["3", " ", "z"]], "]"]], "-", RowBox[List["3", " ", RowBox[List["Sinh", "[", "z", "]"]]]]]], RowBox[List[RowBox[List["3", " ", RowBox[List["Cosh", "[", "z", "]"]]]], "+", RowBox[List["Cosh", "[", RowBox[List["3", " ", "z"]], "]"]]]]]]]]]

 MathML Form

 tanh 3 ( z ) sinh ( 3 z ) - 3 sinh ( z ) 3 cosh ( z ) + cosh ( 3 z ) z 3 3 z -1 3 z 3 z 3 z -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox[RowBox[List["Tanh", "[", "z_", "]"]], "3"], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[RowBox[List["Sinh", "[", RowBox[List["3", " ", "z"]], "]"]], "-", RowBox[List["3", " ", RowBox[List["Sinh", "[", "z", "]"]]]]]], RowBox[List[RowBox[List["3", " ", RowBox[List["Cosh", "[", "z", "]"]]]], "+", RowBox[List["Cosh", "[", RowBox[List["3", " ", "z"]], "]"]]]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2001-10-29