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[" 38.If vectors "A" and "B" are such that "A+B|=|A|=B|],[" then "|vec A-vec B|" may be equated to "],[[" (1) "(sqrt(3))/(2)|vec A|," (2) "|vec A|],[" (3) "sqrt(2)|vec A|," (4) "sqrt(3)|vec A|]]

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