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UPSC NDA I 2017 Mathematics Solved Paper
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© examsnet.com
Question : 54
Total: 120
If
s
i
n
A
=
3
5
,where
450
°
<
540
°
,then
c
o
s
A
2
is equal to ?
[NDA I 2017]
1
√
10
−
√
3
10
√
3
√
10
None of the above
Validate
Solution:
s
i
n
A
=
3
5
⇒
c
o
s
A
=
−
4
5
(∵ 𝐴 lies in 2nd quadrant)
∴
c
o
s
2
A
2
=
1
+
c
o
s
A
2
=
1
10
⇒
c
o
s
A
2
=
1
√
10
(
A
2
lies in 1st quadrant )
© examsnet.com
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