9-3 A certain periodic, bandlimited signal has the following frequencies in the Fourier series: dc, 20 Hz, and 40 Hz. The signal can be expressed in sine-cosine form as x(t) = 5 + 6 cos 40pit + 8 sin 40pit – 5 cos 80pit + 12 sin 80pit Express the signal in (a) amplitude-phase form and (b) complex exponential form.

58 4 - 9-3 A certain periodic, bandlimited signal has the following frequencies in the Fourier series: dc, 20 Hz, and 40 Hz. The signal can be expressed in sine-cosine form as x(t) = 5 + 6 cos 40pit + 8 sin 40pit - 5 cos 80pit + 12 sin 80pit Express the signal in (a) amplitude-phase form and (b) complex exponential form.

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images - 9-3 A certain periodic, bandlimited signal has the following frequencies in the Fourier series: dc, 20 Hz, and 40 Hz. The signal can be expressed in sine-cosine form as x(t) = 5 + 6 cos 40pit + 8 sin 40pit - 5 cos 80pit + 12 sin 80pit Express the signal in (a) amplitude-phase form and (b) complex exponential form.

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