\ 4tH library - FSINH FCOSH FTANH ZEN - Copyright 2009 J.L. Bezemer
\ You can redistribute this file and/or modify it under
\ the terms of the GNU General Public License

[UNDEFINED] fsinh [IF]
[UNDEFINED] fexp [IF] include lib/zenfexp.4th [THEN]

: (e^x) 2dup fexp 2swap fnegate fexp ;
: fsinh (e^x) f- 2 s>f f/ ;
: fcosh (e^x) f+ 2 s>f f/ ;
: ftanh 2dup f+ fexp 1 s>f 2over 2over f- 2rot 2rot f+ f/ ;

[DEFINED] 4TH# [IF] hide (e^x) [THEN]
[THEN]