Prove2Me

lean_workbook_plus_37102

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

bsin⁡A(a2+c2−b2−b2−c2+a2)2abc=bsin⁡A(2a2−2b2)2abc\frac{b \sin A(a^2 + c^2 - b^2 - b^2 - c^2 + a^2)}{2abc} = \frac{b \sin A (2a^2 - 2b^2)}{2abc}

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_37102 (a b c A : ℝ) : (b * Real.sin A * (a^2 + c^2 - b^2 - b^2 - c^2 + a^2)) / (2 * a * b * c) = (b * Real.sin A * (2 * a^2 - 2 * b^2)) / (2 * a * b * c)   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook

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