`BookProof.ChapterSolidHarmonic.fderiv_angular` (u v : E) (μ : ℕ) (x w : E) : fderiv ℝ (angular u v μ) x w = ((μ : ℂ) * (nullCLM u v x) ^ (μ

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`BookProof.ChapterSolidHarmonic.fderiv_angular` (u v : E) (μ : ℕ) (x w : E) : fderiv ℝ (angular u v μ) x w = ((μ : ℂ) * (nullCLM u v x) ^ (μ - 1) * nullCLM u v w).re · Prove2Me