cacosh(3M)

DESCRIPTION

These functions are available only for IA-64.

cacosh() returns the complex arc hyperbolic cosine of z, in the range of a half-strip of non-negative values along the real axis and in the interval [-iPi,iPi] along the imaginary axis. There is a branch cut at values less than 1 along the real axis.

cacoshf() is a float complex version of cacosh(); it takes a float complex argument and returns a float complex result.

USAGE

To use these functions, compile with the default -Ae option. Make sure your program includes <complex.h>. Link in the math library by specifying -lm on the compiler or linker command line.

RETURN VALUES

cacosh(conj(z)) = conj(cacosh(z))

cacosh(±0+i0) returns +0+iPi/2.

cacosh(x+iInf) returns +Inf+iPi/2, for finite x.

cacosh(x+iNaN) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite x.

cacosh(-Inf+iy) returns +Inf+iPi, for positive-signed finite y.

cacosh(+Inf+iy) returns +Inf+i0, for positive-signed finite y.

cacosh(-Inf+iInf) returns +Inf+i3Pi/4.

cacosh(+Inf+iInf) returns +Inf+iPi/4.

cacosh(±Inf+iNaN) returns +Inf+iNaN.

cacosh(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite y.

cacosh(NaN+iInf) returns +Inf+iNaN.

cacosh(NaN+iNaN) returns NaN+iNaN.

ERRORS

No errors are defined.

SEE ALSO

acosh(3M), ccosh(3M), complex(5).

STANDARDS CONFORMANCE

cacosh(), cacoshf(): ISO/IEC C99 (including Annex G, IEC 60559-compatible complex arithmetic)