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[" If "hat alpha" and "hat beta" be two ...

[" If "hat alpha" and "hat beta" be two perpendicularunit vectors such that "bar(x)=hat beta-(hat alpha timesvec x)," then "|bar(x)|" is equal to "],[[" (A) "1," (B) "sqrt(2)," (C) "(1)/(sqrt(2))," (D) None of these "]]

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