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° 

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