Prove2Me

lean_workbook_plus_26146

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by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

Prove that ∣cos⁡xsin⁡x∣≤12|\cos{x}\sin{x}|\le \frac{1}{2}.

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_26146 : ∀ x : ℝ, |cos x * sin x| ≤ 1 / 2   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook

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