KEAM 2012 Math Paper

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Question : 88 of 120

Marks: +1, -0

If

−

a

=2

⋀

i

+3

⋀

j

+α

⋀

k

and

−

b

=3

⋀

i

−α

⋀

j

+2

⋀

k

, then the angle between

−

a

+

−

b

and

−

a

−

−

b

is

0
π
6
π
4
π
3
π
2

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