Currently, asin(1/2) simplifies to %pi/6, and asin(1) is %pi/2. But asin(sqrt(3)/2) doesn't simplify to %pi/3. But sin(%pi/3) becomes sqrt(3)/2. Should asin (and acos and atan) recognize more special values of the arg? I think asin/acos should at least recognize sqrt(3)/2, and atan should recognize 1/sqrt(3) and sqrt(3). Ray