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If a and b are unit vectors and alpha is...

If a and b are unit vectors and `alpha` is the angle between them then a - b will be a unit vector if `alpha` =

A

`pi//4`

B

`pi // 3`

C

`2 pi // 3`

D

`pi // 2`

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-PRODUCTS OF VECTORS-Exercise 1A
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