#1 The ability to define functions

[Anonymous]

The ability to easily define functions, i.e.
"1/2*exp(x)-1/2*exp(-x)" > cosh(x)
or perhaps
1/2*exp(x)-1/2*exp(-x) >> cosh(x) (note: w/o quoting)

which will add a function that you could run yourself, later.

:-)