(a) Differentiate the series -4 1 -cos ((2k + 1)Tx) =0 (2k + 1)? term by term and plot various partial sums for that series on [0, 1]. How does this compare to the derivative of f(æ) = x - - on that interval? (b) Differentiate the series you obtained in part a and plot various partial sums of that on [0, 1]. How does this compare to the second derivative of f(x) = x - on that interval?

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