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What is the angle between the v ectprs (...

What is the angle between the v ectprs `(vec A xx vec B) and (vec Bxx vec A) ?

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The angle between ` (vec A xx vec B) and (vec B xx vec A) is ` 180^(@)` because ` (vec A xx vec B) =- (vec B xx vec A) i.e. they are antiparallel to each other.
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PRADEEP-KINEMATICS-3 Very short
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