| @node atan | |
| @section @code{atan} | |
| @findex atan | |
| POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/atan.html} | |
| Gnulib module: atan | |
| Portability problems fixed by Gnulib: | |
| @itemize | |
| @end itemize | |
| Portability problems not fixed by Gnulib: | |
| @itemize | |
| @end itemize |