1.

IFa = x hati+ y hatj+ z hatkthen( a xx hati) . ( hati+ hatj )+ ( a xxhatj) . ( hatj + hatk ) + ( axx hatk ) . ( hatk + hati ) =

Answer»

`X-y+z`
`x+y+z`
`x+y-z`
`-x +y+z`

ANSWER :B


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