Figure 530 contains a waveform that is called a double-sided exponential, which is defined as the sum

Question:

Figure 5–30 contains a waveform that is called a double-sided exponential, which is defined as the sum of a normal exponential and a reversed exponential. This waveform is 1 at t = 0 and decays exponentially to zero in both directions along the time axis. Write an expression for this waveform.

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