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AMU Engineering 2019 solved paper Solved Paper
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© examsnet.com
Question : 138
Total: 150
Let
a
,
b
,
c
be three vectors form
a
×
(
b
×
c
)
=
(
a
×
b
)
×
c
, if
b
×
(
a
×
c
)
=
0
a
×
(
b
×
c
)
=
0
c
×
a
=
a
×
b
c
×
b
=
b
×
a
Validate
Solution:
Given that,
a
,
b
,
c
are three vectors and
a
×
(
b
×
c
)
=
(
a
×
b
)
×
c
⇒
(
a
.
c
)
b
−
(
a
.
b
)
c
=
(
a
.
c
)
b
−
(
b
.
c
)
a
⇒
−
(
a
.
b
)
c
=
−
(
b
.
c
)
a
⇒
(
b
.
c
)
a
−
(
b
.
a
)
c
=
0
⇒
b
×
(
a
×
c
)
=
0
© examsnet.com
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