Question: If y = f (x) and x changes from x1 to x2, write expressions for the following. (a) The average rate of change of y

If y = f (x) and x changes from x1 to x2, write expressions for the following.
(a) The average rate of change of y with respect to x over the interval [x1, x2]
(b) The instantaneous rate of change of y with respect to x at x = x1.

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