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Manual Section... (3) - page: catan
NAME
catan, catanf, catanl - complex arc tangentsSYNOPSIS
#include <complex.h>
double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);
DESCRIPTION
The catan() function calculates the complex arc tangent of z. If y = catan(z), then z = ctan(y). The real part of y is chosen in the interval [-pi/2,pi/2].One has:
catan(z) = 1 / 2i clog((1 + iz) / (1 - iz))
VERSIONS
These functions first appeared in glibc in version 2.1.CONFORMING TO
C99.SEE ALSO
ccos(3), clog(3), complex(7)COLOPHON
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Time: 15:26:56 GMT, June 11, 2010