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If vece(1) = ( 1,1,1) and vece(2) = ( 1,...

If` vece_(1) = ( 1,1,1) and vece_(2) = ( 1,1,-1) and veca and vecb` are two vectors that ` vece_(1) = 2veca +vecb and vece_(2) veca + 2vecb` then angle between `veca and vecb` is

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