7) index_42.gif

Supposons que x vérifie l’équation. On a alors
tg(Arctg(x+1)+Arctg(x-1))=1
index_43.gif
index_44.gif
index_45.gif
index_46.gif
En vérifiant, on voit que index_47.gif est à rejeter.
Donc, index_48.gif

Apple, the Apple logo and Macintosh are registered trademarks of Apple Computer, Inc.
All other trademarks and names belong to their rightful owners.Designed, developed and maintained entirely on Mac OS X .