Lean-Workbook Plus 51901: Trigonometric identity

Proved

WorkbookRestored.plus_51901

by wamlart · Sep 12, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

lean-workbookrestored-importssource-checked

For every real $x$ , $-\sinh(-x)=\sinh x$ .

Source: Lean-Workbook row lean_workbook_plus_51901 (Apache-2.0). The unchanged proposition comes from the original record; its missing mathematical imports and namespaces are restored here.

Preamble

import Mathlib.Analysis.SpecialFunctions.Trigonometric.Basic
open Real

Formal statement

theorem WorkbookRestored.plus_51901 : ∀ x, -sinh (-x) = sinh x   :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, row lean_workbook_plus_51901; immutable original Prove2Me node a3735312-3ce7-4a9a-b7da-9d1c5ea51299

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