OFFSET
0,2
COMMENTS
The absolute value of the integral{x=0..Pi/2} x^4*log(sin(x )) dx or(d^4/da^4(integral {x=0..Pi/2} cos(ax)*log(sin(x )) dx)) at a=0. The absolute value of m=2 of (-1)^(m+1)*(sum {n=1..infinity} (limit {a -> 0} (d^(2m)/da^(2m)(sin((a+2n)*Pi/2)/n/(a+2n)))))-(Pi/2)^(2m+1)*log(2)/(2m+1). [Seiichi Kirikami and Peter J. C. Moses, Sep 01 2011]
REFERENCES
I. S. Gradshteyn and I. M. Ryzhik, Table of Integrals, Series and Products, 4th edition, 1.441.2
EXAMPLE
0.12204729588592872163...
MATHEMATICA
RealDigits[ N[Pi (2 Pi^4*Log[2]-30 Pi^2*Zeta[3]+225 zeta[5])/320, 150]][[1]]
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
Seiichi Kirikami, Sep 01 2011
STATUS
approved