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[" Given that "vec A+vec B=vec R" and "v...

[" Given that "vec A+vec B=vec R" and "vec A+2vec B" is perpendicular to "vec A" .Then "],[[" (A) ",02B=R," (B) ",B=2R],[" (C) "quad B=R," (D) ",B^(2)=2R^(2)]]

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