3. Determine the Fourier series expansion of the following periodic function: f(t) = { 1 + t₁ 1, t, A. B. C. D. || || || 9 4 + 9 5 + 9-4 + 5 5 y=4+ 9 5 + 00 n=1 00 n=1 ∞ ΣΗ n=1 [сos nπ - 1 η2π n=1 [сos nπ - 1 nn сos n n² [сos nπ n COS -5

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