`BookProof.ChapterSolidHarmonic.angular_euler` (u v : E) (μ : ℕ) (x : E) : fderiv ℝ (angular u v μ) x x = (μ : ℝ) * angular u v μ x

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`BookProof.ChapterSolidHarmonic.angular_euler` (u v : E) (μ : ℕ) (x : E) : fderiv ℝ (angular u v μ) x x = (μ : ℝ) * angular u v μ x · Prove2Me