None

I have tried this expression on 2 different pc's, both fail. ( Of course both
are same version of debian )

bash> expr 12 + 14
26

bash> expr 6 / 2
3

bash> expr 8 % 2
0

bash> expr 8 * 2
expr: symtan error

bash> expr ( 8 * 2 ) 
bash: syntax error near unexpected token '8'

bash> uname -a 
Linux nyc.rr.com 2.4.18-bf2.4 #1 Son Apr 14 09:53:28 CEST 2002 i586 unknown