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UPSC 2013 CDS 1 Math Paper
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Question : 47
Total: 100
What is
(
1
−
tan
A
)
2
+
(
1
+
tan
A
)
2
+
(
1
−
cot
A
)
2
+
(
1
+
cot
A
)
2
equal to ?
sin
2
A
cos
2
A
s
e
c
2
A
c
o
s
e
c
2
A
2
sec
2
A
cosec
2
A
None of the above
Validate
Solution:
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