2.39 Determine the Fourier-series expansion of the following signals: 1. x(t) = cos(2лt) + cos(4лt) - 2. x(t) = cos(2лt) - cos(4лt + л/3) 3. x(t)=2 cos(2л) - sin(4л) 4. x(t) = 8 ∞ A(t-2n) 5. x(t) = 2 80 _ A(t – n)u_1(t – n) - 6. x(t)=|cos 2л fot| (full-wave rectifier output)

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