If `vec(OA) =2hati+3hatj-4hatk and vec(OB) =hatj+hatk` are two vectors through the origin

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If `vec(OA) =2hati+3hatj-4hatk and vec(OB) =hatj+hatk` are two vectors through the origin O, find the projection of `vec(OA) and vec(OB) `
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