Prove2Me

lean_workbook_plus_25157

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

Prove that sin⁡(x)=cos⁡(π2−x)\sin(x) = \cos\left( \frac\pi2 - x\right)

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_25157 (x : ℝ) : sin x = cos (π / 2 - x)   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook

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