and phase 
can be viewed as the
magnitude and angle of a single complex number
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Note that the amplitude
and phase
can be viewed as the
magnitude and angle of a single complex number
which is naturally thought of as the complex amplitude of the complex sinusoid defined by the left-hand side of either Eq.(1.9) or Eq.(1.10). The complex amplitude is the same whether we are talking about the continuous-time sinusoid
or the discrete-time sinusoid
.
