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UPSC NDA 2 2012 Mathematics Paper
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© examsnet.com
Question : 32
Total: 120
What is
s
i
n
[
s
i
n
−
1
(
3
4
)
+
s
i
n
−
1
(
4
5
)
]
equal to?
0
1
2
1
2
Validate
Solution:
s
i
n
[
s
i
n
−
1
(
3
5
)
+
s
i
n
−
1
(
4
5
)
]
=
s
i
n
[
s
i
n
−
1
(
3
5
)
+
cos
−
1
(
3
5
)
]
[
∵
s
i
n
−
1
x
+
cos
−
1
x
=
π
2
]
=
s
i
n
[
π
2
]
=
1
© examsnet.com
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