Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test 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
More than one of the above
5
None of the above