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Byju's Answer
Standard XII
Mathematics
Argument of a Complex Number
If z=1+cosπ/5...
Question
If
z
=
1
+
c
o
s
(
π
5
)
+
i
s
i
n
(
π
5
)
,
then {sin (arg(z))} is equal to
A
√
10
−
2
√
5
4
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B
√
5
−
1
4
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C
√
5
+
1
4
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D
N
o
n
e
o
f
t
h
e
s
e
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Solution
The correct option is
B
√
5
−
1
4
2
c
o
s
2
π
10
+
2
i
s
i
n
π
10
c
o
s
π
10
sin
(
π
10
)
=
√
5
−
1
4
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4
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