lean_workbook_plus_42969

import Mathlib.Analysis.Complex.Basic

theorem lean_workbook_plus_42969 (a b c : ℝ) : a^4 + b^4 + c^4 + a^2 * b^2 + b^2 * c^2 + c^2 * a^2 - 2 * a^3 * b - 2 * b^3 * c - 2 * c^3 * a ≥ 0   :=  by sorry