Same task as in Prob. 16 for the matrix in Prob. 7.

Give an application of the matrix in Prob. 2 that makes the form of the inverse obvious.

Data from Prob 2

Find the inverse by Gauss€“Jordan (or by (4^*) if n = 2). Check by using (1).

Data from Prob 7

Find the inverse by Gauss€“Jordan (or by (4^*) if n = 2). Check by using (1).

 

Transcribed Image Text:

sin 20 cos 20 cos 20 -sin 20