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 Cosh

 http://functions.wolfram.com/01.20.06.0009.01

 Input Form

 Cosh[z]^3 == (1/4) Sum[((3^(2 k) + 3) z^(2 k))/(2 k)!, {k, 0, Infinity}]

 Standard Form

 Cell[BoxData[RowBox[List[SuperscriptBox[RowBox[List["Cosh", "[", "z", "]"]], "3"], "\[Equal]", RowBox[List[FractionBox["1", "4"], " ", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "\[Infinity]"], FractionBox[RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox["3", RowBox[List["2", " ", "k"]]], "+", "3"]], ")"]], " ", SuperscriptBox["z", RowBox[List["2", " ", "k"]]]]], RowBox[List[RowBox[List["(", RowBox[List["2", " ", "k"]], ")"]], "!"]]]]]]]]]]]

 MathML Form

 cosh 3 ( z ) 1 4 k = 0 ( 3 2 k + 3 ) z 2 k ( 2 k ) ! z 3 1 4 k 0 3 2 k 3 z 2 k 2 k -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox[RowBox[List["Cosh", "[", "z_", "]"]], "3"], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox["1", "4"], " ", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "\[Infinity]"], FractionBox[RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox["3", RowBox[List["2", " ", "k"]]], "+", "3"]], ")"]], " ", SuperscriptBox["z", RowBox[List["2", " ", "k"]]]]], RowBox[List[RowBox[List["(", RowBox[List["2", " ", "k"]], ")"]], "!"]]]]]]]]]]]

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

 2001-10-29