Update toy_document_orgmode_R_en.org_1

module2/exo1/toy_document_orgmode_R_en.org

-#+TITLE:  Your title
+#+TITLE:   "À propos de pi"
 #+AUTHOR: Your name
 #+DATE:   Today's date
 #+LANGUAGE: en
@@ -28,7 +28,7 @@ Like we showed in the video, R code is included as follows (and is
 exxecuted by typing ~C-c C-c~):
 
 #+begin_src R :results output :exports both
-print("Hello world!")
+print("Hello world!Hello world!Hello world!")
 #+end_src
 
 #+RESULTS:
@@ -79,3 +79,13 @@ quickly create code blocks in R by typing ~<r~ or ~<R~ followed by
 
 Now it's your turn! You can delete all this information and replace it
 by your computational document.
+
+
+Write the mathematical formulas
+X = 1 + 1
+
+Print  π -> $pi$
+
+Link : ["aiguilles de Buffon"] (https://fr.wikipedia.org/wiki/Aiguille_de_Buffon).
+
+