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If (vec a+ vec b)*(vec a- vec b)=0 and |...

If `(vec a+ vec b)*(vec a- vec b)=0` and `|vec a|=5`, find `|vec b|`.

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PRADEEP PUBLICATION-VECTORS-EXERCISE
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  3. If (vec a+ vec b)*(vec a- vec b)=0 and |vec a|=5, find |vec b|.

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