Que If two vectors vec A and vec B having equal magnitude R are inclined ....

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Que If two vectors vec A and vec B having equal magnitude R are inclined at angle theta then

Option quad A vec A vec B 2 R cos left frac theta 2 right
mathrm B vec A vec B 2 R cos left frac theta 2 right
C vec A vec B sqrt 2 R sin left frac theta 2 right
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