> In radian mode tan(pi/4)=1 and pi/4=arctan(1). In my example, the part > between parenthesis is an approximation of arctan(1). Btw, in dutch arctan > is 'boogtangens' or 'bgtg'. though afai can tell, "arctan" is used more than "boogtangens" (same for sin and cos) --peter martijn