acosh man page on DragonFly

acosh man page on DragonFly

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ACOSH(3)		 BSD Library Functions Manual		      ACOSH(3)

NAME
     acosh, acoshf — inverse hyperbolic cosine function

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     acosh(double x);

     float
     acoshf(float x);

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

RETURN VALUES
     If x is less than one, acosh(x) and acoshf(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.

BSD				  May 6, 1991				   BSD

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