Consider the function f(x)=sinx on the closed interval [0,π]. Answer the following questions.
a. (i) Define the average rate of change of a real-valued function on a closed interval and the instantaneous rate of change at a point.
b. (ii) Calculate the average rate of change of f on [0,π].
c. (iii) Show that there exists a number c in (0,π) where the instantaneous rate of change of f equals the average rate found in part (ii). Determine one such value of c and justify why it lies inside the interval.