I am not sure, if I am just too stupid to find it or if it is not there: Can you tell me, if a NOT sign is in this tool? Like in the definition of a statistical komplement:
P(A) = 1 - P(notA)
It usually looks like a horizontal half line with a vertical half line at its end. A bit like the lower left half of a "+" :-)
This sign is not available, sorry. However it can be added to mathcast by editing the known.xml file. This procedure is explained in the help under customizing mathcast. If you want, send me an email, and I'll add it for you.