NAME
catan, catanf, catanl - complex arc tangents
SYNOPSIS
#include <complex.h>
I double complex catan(double complex z );
I float complex catanf(float complex z );
I long double complex catanl(long double complex z );
Link with -lm.
DESCRIPTION
The
R 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)).
CONFORMING TO
C99
SEE ALSO
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