Inverse matrix in blocks form [closed]

I have an array of 1 shape (X and U are square):

| X Y |
| Z U |

What is the inverse of the matrix (which I do not know) (A and D are square):

| A B |
| C D |

I'm trying to get the inverse array of "A" from array 1, I tried to use "Matrix inversion in block form", but I only get:

  

• A-1 * B = Y * U^-1
  
• C * A^-1 = Z * U^-1
  

Is it possible to find only A^-1 without having to invert array 1?

matinv