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find |veca|,|vecb| if (veca+vecb).(veca-...

find `|veca|,|vecb|` if `(veca+vecb).(veca-vecb)=8` and `|veca|=8|vecb|`

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The correct Answer is:
`=sqrt((8)/(63))`
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MODERN PUBLICATION-VECTOR ALGEBRA -Ncert File Question from Ncert Book (Exercise 10.3)
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