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If vec a ,\ vec b ,\ vec c are three ...

If ` vec a ,\ vec b ,\ vec c` are three vectors such that ` vec adot\ vec b= vec adot\ vec c` and ` vec a\ x\ vec b= vec a\ x\ vec c ,\ vec a\ !=0` , then show that ` vec b= vec c` .

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SL ARORA-Motion in a Plane-Example
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