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If $A . B = \frac{1}{2} A B$ , what is the angle between A and B?

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Correct option is C

IF A→.B→=1/2AB then ABcosθ=1/2ABcosθ=1/2θ=60o

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If A.B=12AB , what is the angle between A and B?

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If $A . B = \frac{1}{2} A B$ , what is the angle between A and B?