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From a graph of a function f(x) we can sketch graph of its derivative f ' (x). To do this, we use some things we talked about earlier.
Be Careful: The word "it" is dangerous.
Look at these two sentences:
The first sentence is unclear. What does "it" mean? There's no way to know. Whenever we use the words "increasing, decreasing, positive, negative," we need to be clear about what (f, f ', or something else?) is increasing, decreasing, positive, or negative.