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AP EAMCET Engineering 2014 Code A Solved Paper
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© examsnet.com
Question : 32
Total: 160
If
−
a
,
−
b
a
n
d
−
c
are vectors with magnitude 2,3 and 4 respectively then the best upper bound of
|
−
a
−
−
b
|
2
+
|
−
b
−
−
c
|
2
+
|
−
c
−
−
a
|
2
among the given values is
97
87
90
93
Validate
Solution:
|
−
a
|
=
2
,
|
−
b
|
=
3
,
|
−
c
|
=
4
2
(
|
−
a
|
2
+
|
−
b
|
2
+
|
−
c
|
2
−
(
−
a
.
−
b
+
−
b
.
−
c
+
−
c
.
−
a
)
)
=2(29-{6cos A+12Cos B+8Cos C})
=2[29-(26)]
© examsnet.com
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