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A signal X(t) is defined by c(t) = 7 sin(3m- 0.57). Which one is a valid complex exponential representation for x(t)? O r(t) =R{7ejteXT} z(t) = R{7e-**/2e33*t) O z(t)=R{7MT Cint} O.(t) = {14e 19/3}