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lemma proved tactic proof

hasDerivAt_Jlog_new

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formal statement (Lean)

  22lemma hasDerivAt_Jlog_new (t : ℝ) : HasDerivAt Jlog (sinh t) t := by

proof body

Tactic-mode proof.

  23  have heq : Jlog = fun s => cosh s - 1 := by
  24    funext s
  25    exact Jlog_eq_cosh s
  26  rw [heq]
  27  exact (hasDerivAt_cosh t).sub_const 1
  28
  29/-- First derivative of Jlog is sinh -/

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depends on (13)

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