theres 2 'smart' calculators and atleast one of them is a graphing one
and then theres the simple calculator your talking about
http://dl.openhandhelds.org/cgi-bin/pandora.cgi?0,0,0,0,113,120
http://dl.openhandhelds.org/cgi-bin/pandora.cgi?0,0,0,0,113,96
annoyingly theyre under office apps not...