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ACOSH(3)                 BSD 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)

HISTORY
     The acosh() function appeared in 4.3BSD.

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

BSD                            January 29, 2013                            BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | STANDARDS