Let x[n] be a sequence of complex numbers defined as for integers n such that − ∞ < n &...

Let x[n] be a sequence of complex numbers defined as

for integers n such that − ∞ < n < ∞. If we define a new sequence y[n] as follows

it is possible to express y[n] in the form .

(a) Determine the frequency in the expression for y[n].

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(b) Determine the values of A and φ.