If the vectors `vec(AB)=3hati+4hatk and vec(AC)=5hati-2hatj+4hatk` are the sides of a triangle ABC

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If the vectors `vec(AB)=3hati+4hatk and vec(AC)=5hati-2hatj+4hatk` are the sides of a triangle ABC, then the length of the median through A is (A) `sqrt(18)` (B) `sqrt(72)` (C) sqrt(33)` (D) `sqrt(45)`
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