Hetware wrote: . > > I would need a lot more in the way of formal development than a typical > calculus book provides in order for me to be convinced of the error of > first evaluating (t-x)/(t-x) symbolically and then evaluating it for an > actual argument. > > If I were to write a computer program for processing functions defined > in terms of algebraic expressions, I could write it so that it > simplifies then evaluates, or I could write it so that it evaluates "as > is".
How do you simplify (t-x)/(t-x)? It only simplifies to 1 when x=/=t.
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