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# 2.1 Graphs of Derivative Functions

#### Deducing Derivative Function Graphs

• Here, it is assumed that the function of the original function is unknown, only its graph.
• Given the graph of a function, some facts can be told about the derivative, recalling the fact that the derivative function represents the instantaneous rate of change of the original function at different points.
• Firstly, it is obvious that the original function and its derivative would usually have the same domain, except when certain x values (or range) where the function is not differentiable.
• It is also logical that the graph of derivative follows that of the original. For instance, if the original function is a polynomial, so will the derivative, thus its graph would look like one.
• We can then look at specific points. If there is(are) stationary point(s) found, we know that f^{\prime}(x)=0 at these point(s). This is because the graph f(x) at these points are somewhat horizontal, thus it’s instantaneous rate of change is 0.
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