12.14 Show that the Fourier series for the function y(x) = |x| in the range - < x < T is T TIR y(x) By integrating this equation term by term from 0 to x, find the function g(x) whose Fourier series is ∞ ∞0 m=0 4 cos(2m +1)x Σ π (2m + 1)² m=0 sin(2m +1)x (2m + 1)³

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Q: 3. dy/dt = e) -1, -∞<o<∞

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