CHI _ _ _ _ _ _ _ _ _ _ _ _ operator

The Chi operator returns the Hyperbolic Cosine Integral function.

syntax:

examples:

defint((cosh(t)-1)/t,t,0,x); 

  - log(x) + psi(1) + chi(x)


on rounded; 

Chi(0.35); 

  - 0.44182471827

The numeric values for the operator Chi are computed via the power series representation, which limits the argument range.