I believe you are using the wrong syntax for the commands.
diff ( function, variable) Example: diff (sin(x^2), x) sgould give you 2.x.cos(x^2)
expand( will expand an expression that has parentheses: expand( (a+b)^2) will give a^2+2a.b+b^2
Integrate $
$ ( tan^-1(x), x) willl give x.tan^-1(x) -(1/2) ln ('x^2+1')
Check the syntax of a command before using it. You will find the list of all comands and their syntax in the reference manual.
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