Prove2Me

Lean-Workbook Plus 44985: Trigonometric inequality

Proved
WorkbookRestored.plus_44985

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

lean-workbookrestored-importssource-checked

For every real xx, ∣sin⁡x∣≤1|\sin x|\le1.

Source: Lean-Workbook row lean_workbook_plus_44985 (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_44985 (x : ℝ) : |sin x| ≤ 1   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, row lean_workbook_plus_44985; immutable original Prove2Me node dcdaf4b3-6a26-472b-9cf8-c58d77864ef2

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