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Let a , b and c be three unit vector...

Let a , b and c be three unit vectors out of which vectors b and c are non -parallel. If `alpha " and " beta` are the angles which vector a makes with vectors b and c respectively and `axx (b xx c) = (1)/(2) b,` Then `|alpha -beta|` is equal to

A

`30^@`

B

`90^@`

C

`60^@`

D

`45^@`

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A
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