How to Calculate Cofactor Matrix

For a matrix A, the cofactor matrix C is calculated as:

C[i][j] = (-1)^(i+j) × det(M[i][j])

Where:

• M[i][j] is the minor matrix obtained by removing row i and column j
• (-1)^(i+j) is the cofactor sign

For a 2×2 matrix:

• Original: [[a, b], [c, d]]
• Cofactor: [[d, -c], [-b, a]]