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\text { . Let } z_{1}=2+3 i \text { and } z_{2}=3-5 i \text { be complex numbers. Calculate the following: } \text { (a) } z_{1}-z_{2} \text {; } \text { (b) } z_{1} \overline{z_{2}} \text {; } \text { (c) } \frac{z_{2}}{z_{1}} \text {; } \text { (d) }\left|z_{1} z_{2}\right| \text {. }

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