lean_workbook_plus_27520
OpenProve that
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_27520 (x : ℝ) : Real.cos (3 * x) - Real.cos (5 * x) = 2 * Real.sin x * Real.sin (4 * x) := by sorry
Source
Prove that
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_27520 (x : ℝ) : Real.cos (3 * x) - Real.cos (5 * x) = 2 * Real.sin x * Real.sin (4 * x) := by sorry