Follow-up Comment #1, bug #47347 (project gsl):
Please see test_tan.c for trouble shooting process and gsl_complex_tan.diff
for a proposed fix.
1. This proposed fixed is based on 7141c7adb8100207ef01ff87a94d5179103fcebc
which add a branch in gsl_complex_tanh to handle a similar issue. In this
commit, tanh was modified to have a separate branch to handle large real part
in input. This is what gsl_complex_tan.diff is doing in essense. In
test_tan.c, this idea is implemented in `gsl_complex_tan_2` for testing
purposes.
2. glibc implementation
(https://github.com/lattera/glibc/blob/a2f34833b1042d5d8eeb263b4cf4caaea138c4ad/math/s_ctan.c)
converts everything to exponential when the imagineary part is big. Is this a
better implementation?
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