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Mathematics
Problem
If
z
1
z_1
z
1
and
z
2
z_2
z
2
be the
n
n
n
th root of unity which subtend right angled at the origin. Then,
n
n
n
must be of the form a.
4
k
+
1
4k+1
4
k
+
1
b.
4
k
+
2
4k+2
4
k
+
2
c.
4
k
+
3
4k+3
4
k
+
3
d.
4
k
4k
4
k
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