OFFSET
0,3
EXAMPLE
log(1+tanh(x)*tan(x))/2 = 1/2*x^2 - 1/4*x^4 + 11/45*x^6 - 73/360*x^8 +- ... .
MATHEMATICA
Log[ 1+Tanh[ x ]*Tan[ x ]]/2 (* Even Part *)
CROSSREFS
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs Mar 1997
STATUS
approved