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UPSC 2016 CDS I Math Paper
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© examsnet.com
Question : 23
Total: 100
(
sin
35
∘
cos
55
∘
)
2
−
(
cos
55
∘
sin
35
∘
)
2
+
2
sin
30
∘
is equal to
[2016 CDS-I]
-1
0
1
2
Validate
Solution:
(
sin
35
∘
cos
55
∘
)
2
−
(
cos
55
∘
sin
35
∘
)
2
+
2
sin
30
∘
[
sin
(
90
∘
−
55
∘
)
cos
55
∘
+
2
sin
30
°
]
2
−
[
cos
(
90
∘
−
35
∘
)
sin
35
∘
]
2
=
(
cos
55
∘
cos
55
∘
)
2
−
(
sin
35
∘
sin
35
∘
)
2
+
2
×
1
2
=
1
−
1
+
1
=
1
© examsnet.com
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