Give an example of a matrix which is its own inverse (that is, where a^-1 = a)

The identity matrix
1  0
0  1

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,

The answer is : 63explanation 60 times 0.05360+363