MATH  Computing on the Home Screen
Using MATH Menu or CATALOG
computing on the home screen
8:nDeriv( function,variable,variablevalue,error)
f'(x) = (f(x + error)  f(x  error))/ )2*error).
The default error value for is .001.
As error becomes smaller, the answer becomes more accurate.
The user must know if the function is differentiable at value.
The calculator will just produce an "answer"
where an answer is not appropriate.
9:fnint( function,variable,from,to,tolerance)
default value of tolerance is 10^(5)

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