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 Csch

 http://functions.wolfram.com/01.23.16.0042.01

 Input Form

 Csch[b]^2 + Sech[a]^2 == Cosh[a - b] Cosh[a + b] Csch[b]^2 Sech[a]^2

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["Csch", "[", "b", "]"]], "2"], "+", SuperscriptBox[RowBox[List["Sech", "[", "a", "]"]], "2"]]], "\[Equal]", RowBox[List[RowBox[List["Cosh", "[", RowBox[List["a", "-", "b"]], "]"]], " ", RowBox[List["Cosh", "[", RowBox[List["a", "+", "b"]], "]"]], " ", SuperscriptBox[RowBox[List["Csch", "[", "b", "]"]], "2"], " ", SuperscriptBox[RowBox[List["Sech", "[", "a", "]"]], "2"]]]]]]]

 MathML Form

 csch 2 ( b ) + sech 2 ( a ) cosh ( a - b ) cosh ( a + b ) csch 2 ( b ) sech 2 ( a ) b 2 a 2 a -1 b a b b 2 a 2 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SuperscriptBox[RowBox[List["Csch", "[", "b_", "]"]], "2"], "+", SuperscriptBox[RowBox[List["Sech", "[", "a_", "]"]], "2"]]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["Cosh", "[", RowBox[List["a", "-", "b"]], "]"]], " ", RowBox[List["Cosh", "[", RowBox[List["a", "+", "b"]], "]"]], " ", SuperscriptBox[RowBox[List["Csch", "[", "b", "]"]], "2"], " ", SuperscriptBox[RowBox[List["Sech", "[", "a", "]"]], "2"]]]]]]]

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

 2001-10-29