(************************************************************************)
(*         *      The Rocq Prover / The Rocq Development Team           *)
(*  v      *         Copyright INRIA, CNRS and contributors             *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(*   \VV/  **************************************************************)
(*    //   *    This file is distributed under the terms of the         *)
(*         *     GNU Lesser General Public License Version 2.1          *)
(*         *     (see LICENSE file for the text of the license)         *)
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Local Open Scope R_scope.
(* Proving a few formulas in the style of John Machin to compute Pi *)
Definition atan_sub u v := (u - v)/(1 + u * v).

Lemma tech : forall x y , -1 <= x <= 1 -> -1 < y < 1 ->
-PI/2 < atan x - atan y < PI/2.