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 4.3 June 5, 2013 DragonFly 4.3