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** 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 **

#### HINT

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