{ a) Find the complex valued signal } z_{1}(t) \text { such that } x_{1}(t)=\Re\left\{z_{1}(t)\right\} \text { Find the complex valued signal } z_{2}(t) \text { such that } x_{2}(t)=\Re\left\{z_{2}(t)\right\} \text { Find the complex valued signal } z(t) \text { such that } x(t)=\Re\{z(t)\}
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