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CATAN(3) Library Functions Manual CATAN(3)

NAME

catan, catanf, catanlcomplex circular arc tangent

SYNOPSIS

#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(), catanf() and catanl() functions compute the complex circular arc tangent of z.
If z = x + iy, then
Re catan(z) = 1/2 * atan(2x / (1 - x^2 - y^2)) + k Pi. 
Im catan(z) = 1/4 * log((x^2 + (y + 1)^2) / (x^2 + (y - 1)^2)).

RETURN VALUES

The catan(), catanf() and catanl() functions return the complex circular arc tangent of z with unbounded imaginary part, and real part in the interval [-Pi/2, Pi/2].

SEE ALSO

cacos(3), casin(3)

STANDARDS

The catan(), catanf() and catanl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
June 5, 2013 OpenBSD-current