Calculate the spectral decomposition of a symmetric matrix C.
To calculate the spectral decomposition of a symmetric matrix C, we need to find its eigenvalues and eigenvectors. The spectral decomposition can be written as:

C = QΛQ^T

where Q is an orthogonal matrix containing the eigenvectors of C as columns, Λ is a diagonal matrix with the eigenvalues of C on the diagonal, and Q^T is the transpose of Q.

Here are the steps to compute the spectral decomposition:

1. Find the eigenvalues (λ) and eigenvectors (v) of the symmetric matrix C.
2. Normalize the eigenvectors so that they have unit length.
3. Form the orthogonal matrix Q using the normalized eigenvectors as columns.
4. Create the diagonal matrix Λ by placing the eigenvalues along the diagonal.
5. Compute the product QΛQ^T.

Please provide the specific symmetric matrix C for which you want to compute the spectral decomposition, and I'll perform these calculations for you.