ctan(3M)

DESCRIPTION

These functions are available only for IA-64.

ctan() returns the complex tangent of z.

ctanf() is a float complex version of ctan(); 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

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

ctan(+0+i0) returns +0+i0.

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

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

ctan(+x+iInf) returns 0sin(2x)+i1, for positive-signed finite x.

ctan(+Inf+iInf) returns ±0+i1 (where the sign of the real part of the result is unspecified).

ctan(+NaN+iInf) returns ±01+i1 (where the sign of the real part of the result is unspecified).

ctan(0+iNaN) returns 0+iNaN.

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

ctan(NaN+iNaN) returns NaN+iNaN.

ERRORS

No errors are defined.

SEE ALSO

tan(3M), catan(3M), complex(5).

STANDARDS CONFORMANCE

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