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ACOSH(3)                   Library Functions Manual                   ACOSH(3)

NAME
     acosh, acoshf, acoshl - inverse hyperbolic cosine function

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     acosh(double x);

     float
     acoshf(float x);

     long double
     acoshl(long double x);

DESCRIPTION
     The acosh(), acoshf(), and acoshl() functions compute the inverse
     hyperbolic cosine of the real argument x.

RETURN VALUES
     If x is less than one, acosh(x), acoshf(x), and acoshl(x) return NaN and
     set the global variable errno to EDOM.

SEE ALSO
     asinh(3), atanh(3), exp(3), math(3)

STANDARDS
     The acosh() function conforms to ISO/IEC 9899:1999 ("ISO C99").

HISTORY
     The acosh() function appeared in 4.3BSD.

NetBSD 10.99                   January 29, 2013                   NetBSD 10.99