1.

Unit vector making angles pi/6, pi/6, pi/3 with bar(i), bar(j), bar(k) directions is

Answer»

`1/sqrt(3)(BAR(i)+bar(J)+bar(K))`
`1/sqrt(3)(bar(i)-bar(j)+bar(k))`
`1/sqrt(3)(bar(i)-bar(j)-bar(k))`
IMPOSSIBLE to get such a vector

Answer :D


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