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UPSC NDA I 2012 Mathematics Paper
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© examsnet.com
Question : 43
Total: 120
What is the value of
s
e
c
2
tan
−
1
(
5
11
)
?
121
∕
96
217
∕
921
146
∕
121
267
∕
121
Validate
Solution:
s
e
c
2
(
tan
−
1
(
5
11
)
)
1
+
tan
2
(
tan
−
1
(
5
11
)
)
1
+
[
tan
{
tan
−
1
(
5
11
)
2
}
]
1
+
25
121
121
+
25
121
=
146
121
© examsnet.com
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