00:01
Hello, so in this case, we're going to have that our vector u is going to be the vector 1, 2, 3.
00:06
So we first want to find the magnitude of u.
00:09
The magnitude of u is just going to be the square root of the dot product with u dotted with itself.
00:15
So that's the square root of 1 times 1, plus 2 times 3, which we're talking to be the square root of 14.
00:27
Okay, so the magnitude of u is square root of 14, and then the magnitude of b, in this case, it's going to be the square root of the dot product of v with itself.
00:40
So that's going to be the square root of 2, 2 plus 3 times.
00:50
It's going to be the square root of 29.
00:55
All right, and then we can use these values to find theta...