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Mathematics
Mathematics
Problem
If
∣
z
−
2
+
i
∣
≤
2
|z - 2 + i| \le 2
∣
z
−
2
+
i
∣
≤
2
, where
i
=
−
1
i = \sqrt{-1}
i
=
−
1
, then find the greatest and least value of
∣
z
∣
|z|
∣
z
∣
.
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