1.

If veca= hati + hatj - hatk, vecb = hati - hatj + hatk and vecc is unit vector perpendicular to the vector vecaand coplanar with veca and vecb, then a unit vector vecd perpendicular to both veca and vecc is :

Answer»

`(1)/(sqrt6) (2 hati - AHTJ + hatk)`
`(hati+ hatj)/(sqrt2)`
`(hatj + hatk)/(sqrt2)`
`(hati +hatk)/(sqrt2).`

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