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Mathematics
Problem
If
z
1
z
2
\frac{z_1}{z_2}
z
2
z
1
is purely imaginary then
∣
z
1
+
z
2
z
1
−
z
2
∣
\left| \frac{z_1 + z_2}{z_1 - z_2} \right|
z
1
−
z
2
z
1
+
z
2
is equal to (1) 1 (2) 2 (3) 3 (4) 0
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