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Q.

The angle between vector A and (A - B) is

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a

tan1 A0.7B

b

tan1 3B2AB

c

tan1 B2AB32

d

tan1 BcosθABsinθ

answer is C.

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Detailed Solution

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 Angle between A and B,θ=60°

 Angle betwenn A and A-B

tanα=BsinθA-Bcosθ

=B32 A-B×122

tanα=3B2A-B

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