$\"\"$

\

The matrix is $\"\"$ .

\

Definition of inverse matrix :

\

If $\"\"$ is an $\"\"$ then $\"\"$ , where $\"\"$ .

\

Let $\"\"$ , then $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Therefore, matrix $\"\"$ has an inverse.

\

$\"\"$

\

Cofactor of $\"\"$ is

\

$\"\"$

\

$\"\"$

\

Cofactor of $\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The inverse of the $\"\"$ is $\"\"$ .

\

$\"\"$

\

$\"\"$ .