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AIEEE 2012 Solved Paper

Section: Mathematics
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Question : 81 of 89
 
Marks: +1, -0
Let
→
a
 and
→
b
 two unit vectors. If the vectors
→
c
=
∧
a
+2
∧
b
 and
→
d
=5
∧
a
−4
∧
b
 are perpendicular to each other, then the angle between
→
a
 and
→
b
 is :
[AIEEE 2012]
Validate
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