Becker et al. produced a striking trace formula for the sum of fourth powers of generalized magic angles, θ , for the chiral model of twisted bilayer graphene (TBG) with the exact Bistritzer–MacDonald potential: ∑ θ⁴ = 8 π / √3 . The purpose of this note is to generalize this formula to a larger class of potentials satisfying the symmetries of the model.