Prove2Me

lean_workbook_plus_20381

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

Calculate tan⁡(π2+π4)\tan\left(\frac{\pi}{2} + \frac{\pi}{4}\right).

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_20381 (x : ℝ) : tan (π / 2 + π / 4) = -1   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook

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