catan, catanf, catanl — complex arc tangents
#include <complex.h>
double complex catan( |
double complex | z) ; |
float
complex catanf( |
float complex | z) ; |
long
double complex catanl( |
long double complex | z) ; |
Link with −lm.
The catan
() function
calculates the complex atan(). 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)).