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Complex Numbers
medium
0:00.0
Compute
(
2
+
i
)
(
2
−
i
)
(2 + i)(2 - i)
(
2
+
i
)
(
2
−
i
)
.
A
5
5
5
B
4
4
4
C
3
+
4
i
3 + 4i
3
+
4
i
D
4
+
i
4 + i
4
+
i
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