# cacosh.f

          COMPLEX FUNCTION CACOSH (Z)
    C***BEGIN PROLOGUE  CACOSH
    C***PURPOSE  Compute the arc hyperbolic cosine.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  C4C
    C***TYPE      COMPLEX (ACOSH-S, DACOSH-D, CACOSH-C)
    C***KEYWORDS  ACOSH, ARC HYPERBOLIC COSINE, ELEMENTARY FUNCTIONS, FNLIB,
    C             INVERSE HYPERBOLIC COSINE
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C CACOSH(Z) calculates the complex arc hyperbolic cosine of Z.
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  CACOS
    C***REVISION HISTORY  (YYMMDD)
    C   770401  DATE WRITTEN
    C   861211  REVISION DATE from Version 3.2
    C   891214  Prologue converted to Version 4.0 format.  (BAB)
    C***END PROLOGUE  CACOSH