DragonFly On-Line Manual Pages

CTAN(3)               DragonFly Library Functions Manual               CTAN(3)

NAME
     ctan, ctanf, ctanl -- complex circular tangent

SYNOPSIS
     #include <complex.h>

     double complex
     ctan(double complex z);

     float complex
     ctanf(float complex z);

     long double complex
     ctanl(long double complex z);

DESCRIPTION
     The ctan(), ctanf() and ctanl() functions compute the complex circular
     tangent of z.

     If z = x + iy, then

           ctan(z) = (sin(2x) + i sinh(2y)) / (cos(2x) + cosh(2y)).

     On the real axis the denominator is zero at odd multiples of Pi/2.  The
     denominator is evaluated by its Taylor series near these points.

           ctan(z) = -i ctanh(iz).

RETURN VALUES
     The ctan(), ctanf() and ctanl() functions return the complex circular
     tangent of z.

SEE ALSO
     ccos(3), csin(3)

STANDARDS
     The ctan(), ctanf() and ctanl() functions conform to ISO/IEC 9899:1999
     (``ISO C99'').

DragonFly 4.1                    June 5, 2013                    DragonFly 4.1