Using A = [ cos a -sin a
sin a cosa ]
Find A inverse
Show that S) sub 2 (R) is abelian
To find the inverse of A, we just use the inverse matrix formula for any 2x2 matrix, which says that we need to swap the diagonal elements (keeping their signs), then we swap the other 2 elements and also change their signs to ...
Matrix Multiplication and Calculation of Inverses are investigated.