Q 1115223160.     If a line makes an angle of `pi/4` with the positive directions of each of `x`- axis and y- axis, then angle that the line makes with the positive direction of the `z`- axis is :

JEE 2007
A

`pi/3`

B

`pi/6`

C

`pi/4`

D

`pi/2`

HINT

We know that : `l^2+m^2+n^2=1` here, `l=cos(pi/4), m=cos(pi/4)` and `n` is unknown.

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