=+12. Continuing Problem 11, let ck be the kth Fourier series coefficient of a general periodic function

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=+12. Continuing Problem 11, let ck be the kth Fourier series coefficient of a general periodic function f(x). If |ck| ≤ ar|k| for constants a ≥ 0 and 0 ≤ r < 1, then verify using equation (13.5) that

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ˆbk − ck| ≤ arn rk + r−k 1 − rn

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