Originally Posted by

**Naur** I'm not sure where my manual is.

Why do you have to choose an x value? For example, the derivative of 2x = 2. How would you do that on a calculator?

It seems almost useless if you can only use it for a single point.

For example, the where I found out about it, I was reading the answer of a question. I had to sketch the derivative, and it said to use nDeriv in the calculator. But it seems it wouldn't help you sketch a graph, aside from delivering the derivative at certain points on the derivative function.