Basic Maths and Units and DimensionsHard
Question
Let 
and 
are unit vectors inclined at an angle 
with each other such that 
, then -
and are unit vectors inclined at an angle with each other such that , then -Options
A.
= 
= B.
is perpendicular to 
is perpendicular to C.
and 
are coplanar vectors
and are coplanar vectorsD.
is coplanar with 
and 
is coplanar with and Solution
= 
Let
=
⇒
is coplanar with 
and 
⇒ D is correct.
(A)
= 
|
- 
|| = 
(B)
= 
= 
,
= 
⇒
⇒
is perpendicular to 
(C) [
]2 = 
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