Find the adjoint of the matrix `A=[(1,1,1),(2,1,-3),(-1,2,3)]`.

Explanation

To find the adjoint of the matrix \( A = \begin{pmatrix} 1 & 1 & 1 \\ 2 & 1 & -3 \\ -1 & 2 & 3 \end{pmatrix} \), we will follow these steps:

### Step 1: Find the Cofactor Matrix

The cofactor \( C_{ij} \) of an element \( a_{ij} \) in matrix \( A \) is calculated using the formula:
\[ C_{ij} = (-1)^{i+j} \cdot M_{ij} \]
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