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`BookProof.MixedLinearEsa.hasDerivAt_gaugePhase_line` (b m : V) (hm : m ≠ 0) (x : V) : HasDerivAt (fun t : ℝ => gaugePhase b m (x + t • m)) (-(inner ℝ x b : ℝ)) 0 · Prove2Me