Paratrophic Determinants over $\mathbb{Z}\mathrm{/}N\mathbb{Z}$ via Discrete Fourier Transform

In this note, we investigate the paratrophic determinants attached to the multiplicative semigroup $\mathbb{Z}\mathrm{/}N\mathbb{Z}$. We show that, via discrete Fourier, cosine, and sine transforms, these determinants factor into products of group determinants indexed by $d\mathrm{\mid }N$. This yields explicit formulas for several determinant families, including determinants involving periodic Bernoulli functions and powers of the tangent function. As an application, we also prove a corrected version of a conjecture of Sun Zhi-Wei.