A unit vector a makes an angle pi/ 4 wit...

A unit vector a makes an angle `pi/ 4` with z-axis. If `a + i + j` is a unit vector, then a can be equal to

A

`i/2+j/2+k/sqrt(2)`

B

`i/2 +j/2-k/sqrt(2)`

C

`-i/2-j/2+k/sqrt(2)`

D

none of these

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The correct Answer is:

C

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