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`BookProof.ChapterRadialLaplacian.fderiv_comp_normSq` {G : ℝ → ℝ} {x : E} (hG : ContDiffAt ℝ 2 G (‖x‖ ^ 2)) : (fderiv ℝ fun z : E => G (‖z‖ ^ 2)) =ᶠ[nhds x] fun y => (2 * deriv G ( · Prove2Me