Question: (a) By graphing the function f(x) = (cos 2x - cos x) / x2 and zooming in toward the point where the graph crosses the

(a) By graphing the function f(x) = (cos 2x - cos x) / x2 and zooming in toward the point where the graph crosses the -axis, estimate the value of limx→0 f(x).
(b) Check your answer in part (a) by evaluating f(x) for values of x that approach 0.

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