If and then find
Given and
We need to find the magnitude of vector.
We know unit vector in the direction of a vector is given by .
Recall the cross product of two vectors and is
Here, we have (a1, a2, a3) = (, 0, ) and (b1, b2, b3) = (4, 3, 1)
Recall the magnitude of the vector is
Now, we find.
Thus,