Consider the periodic function defined within one period by the formula: y (x)=x + 1 -(x + 1)² if - 5x² (b)(i) Present the first four terms of the series plus the zero term in the explicit form. (ii) Find the Fourier spectrum 4 = √√²+ b² where a, and b, are the amplitudes of the cosine and sine Fourier harmonics respectively and plot it against n in the log-log scale.

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