1) (AB)^-1=A^-1B^-1 A and B are nonsingular nxn
2) If A is nonsingular then A^-1 is nonsingular also and then (A^-1)^-1=A
The Attempt at a Solution
1) I do know that I have to multiply but I don´t know why. Can you tell me why??
This is how I do it:
2) ((A^-1)^-1)*A = ?????