1.

If a.hati=4 then (axx hatj).(2hatj-3hatk) is equal to

Answer»

12
2
0
`-12`

Solution :`(axxhat(J)).(2hat(j)-3hat(k))=a.{hat(j)XX(2hat(j)-3hat(k))}`
`=a.{-3(hat(j)xxhat(k))}=-3(a.hat(i))`
`=-12""[ :' a.hat(i)=4," given"]`


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