Six, sine and cosine integral integral
[Sine integral definitions and series expression]
They are 
the entire function.
[Cosine integral definitions and series expression]
It is removed axle in 
the 
in-plane single value analysis, the formula 
for the Euler constant.
Definition
[Relationship between the function] When 
the time is a real number, with
[Asymptotic expression]
Where 
Particularly
