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VITEEE 2011 Solved Paper
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© examsnet.com
Question : 110
Total: 120
Find the value of sin 12° sin 48° sin 54° .
1
2
1
4
1
6
1
8
Validate
Solution:
sin 12° sin 48° sin 54°
= sin 12° sin (60° - 12°) sin (90° - 36°)
=
s
i
n
12
°
s
i
n
(
60
°
−
12
°
)
s
i
n
72
°
c
o
s
36
°
s
i
n
72
°
=
[
s
i
n
12
°
s
i
n
(
60
°
−
12
°
)
s
i
n
(
60
°
+
12
°
)
c
o
s
36
°
]
s
i
n
72
°
=
s
i
n
12
°
(
s
i
n
2
6
°
−
s
i
n
2
12
°
)
c
o
s
36
°
s
i
n
72
°
=
s
i
n
12
°
(
3
4
−
s
i
n
2
12
°
)
c
o
s
36
°
s
i
n
72
°
=
3
s
i
n
12
°
−
4
s
i
n
3
12
°
4
.
c
o
s
36
°
s
i
n
72
°
=
s
i
n
36
°
c
o
s
36
°
4
s
i
n
72
°
=
1
2
s
i
n
72
°
4
s
i
n
72
°
=
1
8
© examsnet.com
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