[1] Let f(x) be a periodic function with period 27 and has the formula 2x - {² f(x) = -T≤ x < -π/2, -π/2 ≤ x < T. (a) Find the Fourier series of f(x). (b) To what value does the above Fourier series converge at x = ? at x = -7/2? at x = π/2? at x = π?

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