1.

Let vec(alpha)=hat(i)+hat(j)+hat(k),vec(beta)=hat(i)-hat(j)-hat(k)andvec(gamma)=-hat(i)+hat(j)-hat(k) be three vectors. A vector vec(delta), in the plane of vec(alpha)andvec(beta), whose projection on vec(gamma)" is "(1)/sqrt(3), is given by

Answer»

`-hat(i)-3HAT(J)-3hat(k)`
`hat(i)-3hat(j)-3hat(k)`
`-hat(i)+3hat(j)+3hat(k)`
`hat(i)+3hat(j)-3hat(k)`

ANSWER :C


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