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CBSE XI
>>
Math
>>
Complex Numbers and Quadratic Equations
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Q)
Let
z
=
a
(
cos
π
5
+
i
sin
π
5
)
a
∈
R
,
|
a
|
<
1
then
S
=
z
2015
+
z
2016
+
z
2017
+
.
.
.
.
.
.
.
equals
(
A
)
a
2015
z
−
1
(
B
)
a
2015
1
−
z
(
C
)
z
2015
1
−
a
(
D
)
z
2015
a
−
1
Share
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