1.

Unit vector making angles pi/3, pi/3, (3pi)/4 with bar(i), bar(j), bar(k) is

Answer»

`1/2bar(i)+1/2bar(J)-1/2bar(K)`
`1/2bar(i)+1/2bar(j)-1/sqrt(2)BAR(k)`
`1/2bar(i)-1/2bar(j)-1/sqrt(2)bar(k)`
`bar(i)-bar(j)+bar(k)`

ANSWER :A


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