1.

If a=hat(i)-hat(j)-hat(k), b=2hat(i)-3hat(j)+hat(k)" and "p_(1), p_(2) are the orthogonal projection vectors of a on b and b on a respectively, then (p_(1)+p_(2))*(p_(1)-p_(2))=

Answer»

`-46/21`
`25/7`
`44/7`
`-88/21`

ANSWER :D


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