00:01
Hello, so here is our given rotation matrix r.
00:05
So find the inverse, we're just going to use gauss jordan.
00:08
So we're going to take the matrix here.
00:09
We're going to put this line and then put the 3x3 identity on the right -hand side.
00:14
So we have 1 -0 -0 -0 -0 -0 -1.
00:20
Okay, so we just use gauss -jordan elimination to then convert the identity to the left -hand side.
00:25
So we want to get a 1 in the top left -hand corner here.
00:29
So we're going to divide row 1 by 0 .8.
00:32
So we're going to do 1 over 0 .8 times row 1 to get a 1 in the top quarter.
00:39
Now we want to get zeros beneath.
00:41
So we're going to do negative 0 .6 times row 1.
00:47
And then we're going to add that to row 3...