Question: 5. Is the subset D= {z :0 < Arg(z) < T/4, z 0} open? 6. Is the subset D = {z : |2| <

5. Is the subset D= {z :0 < Arg(z) < T/4, z

5. Is the subset D= {z :0 < Arg(z) < T/4, z 0} open? 6. Is the subset D = {z : |2| < 1}U{z :|z+2| < 1} connected? 7. Prove that the subset D = {z :|z| < 1} is an open set.

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