defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Vector Algebra Scalar and Vector Product
If \(\rm \vec a=5\hat i-\hat j-3\hat k \ \&\ \vec b=\hat i-3\hat j+5\hat k\) the angle between \(\vec a+\vec b\) and \(\vec a-\vec b\) is:
1
60°
2
90°
3
120°
4
30°