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,