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A009366
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Expansion of log(1+tan(tan(x))).
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0
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0, 1, -1, 6, -22, 176, -1192, 12240, -122288, 1561088, -20588544, 318007808, -5193155328, 94807748608, -1841205505024, 38942692972544, -875204314126336, 21088169713729536, -537861879179575296, 14558790290337431552
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OFFSET
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0,4
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LINKS
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FORMULA
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MATHEMATICA
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Log[ 1+Tan[ Tan[ x ] ] ]
CoefficientList[Series[Log[1 + Tan[Tan[x]]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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