Two vectors 
and 
have equal magnitudes. If magnitude of 
is equal to two times the magnitude of 
, then the angle between 
and 
will be :
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
(a 2 + b 2 + 2ab cos 
) = 4 (a 2 + b 2 -2ab cos 
)
put a = b we get
2a 2 + 2a 2 cos 
= 8a 2 - 8a 2 cos 
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