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VITEEE 2017 Solved Paper
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© examsnet.com
Question : 111
Total: 125
If f (x) =
|
c
o
s
x
1
0
1
2
c
o
s
x
1
0
1
2
c
o
s
x
|
, then
π
∕
2
∫
0
f (x) dx is equal to
1
4
-
1
3
1
2
1
Validate
Solution:
f (x) =
4
c
o
s
3
x
- cos x - 2 cos x = cos 3x
[Expansion of determinant]
∴
π
∕
2
∫
0
f (x) dx =
s
i
n
3
x
3
|
0
π
∕
2
= -
1
3
© examsnet.com
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