The characteristic polynomial of a 3⨯3 matrix M is -𝜆³+ mbox tr(M)𝜆²- mbox tr( mbox adj(M))𝜆+ mbox det(M), where mbox adj(M) denotes the adjugate of M.

His head grows fevered, and his pulse / The quick successive throbs convulse; / In vain from side to side he throws / His form, in courtship of repose; …

To make Whitley Goose, an excellent old country recipe, I allow two large onions for each person […]

It can be concluded that the coupling degree of Yuwangtai District is the lowest; the coupling degree of the Shunhe Huizu area is higher, the coupling degree of Longting District is higher, and the coupling degree of Gulou District is the highest.