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AP EAPCET 23-Aug-2021 Shift 1 Paper
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© examsnet.com
Question : 18
Total: 160
sin
2
π
5
+
sin
4
π
5
+
sin
6
π
5
+
sin
8
π
5
=
0
1
√
2
2
1
2
Validate
Solution:
sin
2
π
5
+
sin
4
π
5
+
sin
6
π
5
+
sin
8
π
5
=
(
sin
2
π
5
+
sin
8
π
5
)
+
(
sin
4
π
5
+
sin
6
π
5
)
=
2
sin
(
10
π
5
×
2
)
cos
(
−
6
π
5
×
2
)
+
2
sin
(
10
π
5
×
2
)
cos
(
−
2
π
5
×
2
)
=
2
sin
π
cos
(
−
3
π
5
)
+
2
sin
π
cos
(
−
2
π
10
)
[
∵
sin
π
=
0
]
=
0
© examsnet.com
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