If A =[abba] and A2 =[xyyx] , then
x = a2 + b2 , y = 2ab
x = 2ab, y = a + b
x = a2 – b2 ,y = ab
x = 2ab, y = a – b
A=[abba] A2=[abba][abba]=[a2+b2ab+abab+abb2+a2]=[xyyx]
Therefore x=a2+b2 and y = 2ab