Binary or hexadecimal would be desirable. Otherwise, functions are represented quite well. Sqrt (sin ^ 2 x + cos ^ 2 x) he creates and sin (45 °) is just displayed numerically ... sin (45 °) = 1 / sqrt 2 is still "true". The constants my Vorrezensent is right, pi and e, but are therefore more likely especially ... after all, you can specify which. The comparison to the Calculator app RealCalc I can not quite understand. Possibly we will see what else is in the online help, eigtl very useful.