Express the real part of each of the following signals in the form Ae¯a" where A, a, w, and o are real numbers with A > 0 and - (а) х1(() (c) x3(1) = e- sin(3t + 7) cos(wt + 4), T <¢ < T: (b) x2(1) = /2eilA cos(3t + 277) (d) х4(1) -2 %3D je-2-j100)| %3D %3D

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