NAME
catanh, catanhf,
catanhl —
complex inverse hyperbolic
tangent
SYNOPSIS
#include
<complex.h>
double complex
catanh(double
complex z);
float complex
catanhf(float
complex z);
long double complex
catanhl(long
double complex z);
DESCRIPTION
The
catanh(),
catanhf()
and
catanhl()
functions compute the complex inverse hyperbolic tangent of
z.
For all complex floating-point numbers z,
catanh(z) = -i catan(iz).
RETURN VALUES
The catanh(),
catanhf() and catanhl()
functions return the complex inverse hyperbolic tangent of
z with imaginary part in the interval [-Pi/2, Pi/2],
and unbounded real part.
SEE ALSO
STANDARDS
The catanh(),
catanhf() and catanhl()
functions conform to ISO/IEC 9899:1999
(“ISO C99”).