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%I #4 Feb 24 2012 12:50:51
%S 1,-1,21,-717,46025,-4817209,734055069,-154121194437,42674286160913,
%T -15062120873888497,6601538801733818277,-3517682024725193957181,
%U 2239550167783452398617817,-1678950113256157460626211113
%N sech(cos(x)*sin(x))=1-1/2!*x^2+21/4!*x^4-717/6!*x^6+46025/8!*x^8...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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