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[" 11.Let "a" and "b" be two unit vector...

[" 11.Let "a" and "b" be two unit vectors inclined at an angle "theta" ,then "],[sin(theta/2)" is equal to "],[[" (A) "(1)/(2)|a-b|," (B) "(1)/(2)|a+b|],[" (C) "|a-b|," (D) "|a+b|]]

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