complex tangent function
Math library (libm, -lm)
These functions calculate the complex tangent of z.
The complex tangent function is defined as:
ctan(z) = csin(z) / ccos(z)
For an explanation of the terms used in this section, see attributes(7).
C11, POSIX.1-2008.
glibc 2.1. C99, POSIX.1-2001.