Teaching DSSSB TGT Mock Test 2025 Mathematics Vector Algebra Scalar and Vector Product

If \(\rm \vec{i},\vec{j}, \vec{k}\)  are mutually perpendicular vectors, then the angle between \(\rm \vec{i} + \vec{j} + \vec{k}\) and \(\rm \vec{k}\)  is

1
cos−1 (1/3) 
2
cos−1 (-1/√3) 
3
cos−1 (1/√3) 
4
cos−1 (1/5) 
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