Functions
Function	WDigamma (X As Double) As Variant
	Digamma (or psi) function ψ(x)

Function	WPolygamma (X As Double, N As Long)
	Polygamma function ψn(x) (derivative of psi function ψ(x))

Function	WTrigamma (X As Double)
	Trigamma function ψ1(x)

Detailed Description

This is the group of C7c. Polygamma functions.

Functions