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vec(a)=2hati-2hatj+hatk,vec(b)=hati+2hat...

`vec(a)=2hati-2hatj+hatk,vec(b)=hati+2hatj-2hatk` and `vec( c )=2hati-hatj+4hatk` then find the projection of `vec(b)+vec( c )` on `vec(a)`.

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