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JEE Main 12 Jan 2019 Shift 2 Solved Paper

Section: Mathematics
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Question : 48 of 90
 
Marks: +1, -0
Let
→
a
,
→
b
 and
→
c
 be three unit vectors, out of which vectors
→
b
 and
→
c
 are non-parallel. If α and β are the angles which vector
→
a
 makes with vectors
→
b
 and
→
c
 respectively and
→
a
×(
→
b
×
→
c
) =
1
2
→
b
 , then |α- β| is equal to :
[12 Jan 2019 Shift 2]
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