Step 1: Identify the matrix I, which is given as [[2, 1], [1, 2]].
Step 2: Locate the diagonal elements of the matrix. The diagonal elements are the ones from the top left to the bottom right. In this case, they are 2 (from the first row and first column) and 2 (from the second row and second column).
Step 3: Add the diagonal elements together. So, you calculate 2 + 2.
Step 4: Write down the result of the addition. The sum is 4.
Step 5: Conclude that the trace of the matrix I is 4.
Trace of a Matrix – The trace of a matrix is defined as the sum of the elements on its main diagonal.
