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Let vec a , vec b , vec c be three vect...

Let ` vec a , vec b , vec c` be three vectors such that `| vec a|=1,| vec b|=2a n d| vec c|=3.` If the projection of ` vec b` along a is equal to the projection of ` vec c` along ` vec aa n d vec b , vec c` are perpendicular to each other, find `|3 vec a-2 vec b+2 vec c|dot`

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