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Given |vec(A)_(1)| =2, |vec(A)_(2)|=3 and |vec(A)_(1) + vec(A)_(2)| =3. If the value of |(vec(A)_(1) + 2 vec(A)_(2)). (3vec(A)_(1) -4 vec(A)_(2))| " is " 4^(n) find n |
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