/sys$common/syshlp/HELPLIB.HLB  —  CRTL  acosh
    Returns the hyperbolic arc cosine of its argument.

    This function is OpenVMS Alpha and Integrity servers only.

    Format

      #include  <math.h>

      double acosh  (double x);

      float acoshf  (float x);

      long double acoshl  (long double x);
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