lean_workbook_plus_52577

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

$cos(x)=0$ $\forall$ $x\in$ $(2n+1)\frac{\pi}{2}$ where $n$ $\in$ $Z$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_52577 : ∀ n : ℤ, cos ((2 * n + 1) * π / 2) = 0   :=  by sorry

Source