WChi WCi WShi WSi

WChi() Function WChi ( X As  Double ) Hyperbolic cosine integral Chi(x) Purpose Chi computes the hyperbolic cosine integral. Chi(x) = ∫ (cosh(t)-1)/t dt [0, x] + ln(x) + γ (γ: Euler's constant) Returns Hyperbolic cosine integral Chi(x). (If x < 0, returns real part = Chi(|x|)) Parameters [in] X Argument x. (X <> 0)