ctanh(3M)

DESCRIPTION

These functions are available only for Integrity servers.

ctanh() returns the complex hyperbolic tangent of z.

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

ctanhl() is a long double complex version of ctanh(); it takes a long double complex argument and returns a long double complex result.

ctanhw() is an extended complex version of ctanh(); it takes an extended complex argument and returns an extended complex result.

ctanhq() is equivalent to ctanhl() on HP-UX systems.

USAGE

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

RETURN VALUE

ctanh(conj(z)) = conj(ctanh(z)) and ctanh is odd.

ctanh(+0+i0) returns +0+i0.

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

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

ctanh(+Inf+iy) returns 1+i0sin(2y), for positive-signed finite y.

ctanh(+Inf+iInf) returns 1±i0 (where the sign of the imaginary part of the result is unspecified).

ctanh(+Inf+iNaN) returns 1±i0 (where the sign of the imaginary part of the result is unspecified).

ctanh(NaN+i0) returns NaN+i0.

ctanh(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for all nonzero numbers y.

ctanh(NaN+iNaN) returns NaN+iNaN.

ERRORS

No errors are defined.

SEE ALSO

tanh(3M), catanh(3M), complex(5).

STANDARDS CONFORMANCE

ctanh(), ctanhf(), ctanhl() : ISO/IEC C99 (including Annex G, ``IEC 60559-compatible complex arithmetic'')