EGALITE TRIGONOMETRIQUE

Sujet: Re: EGALITE TRIGONOMETRIQUE Mer 03 Mar 2010, 11:15

Il est facile de prouver que :
$EGALITE TRIGONOMETRIQUE Gif.latex?sin%28%5Cfrac%7B%5Cpi%20%7D%7B9%7D%29.sin%28%5Cfrac%7B2%5Cpi%20%7D%7B9%7D%29.sin%28%5Cfrac%7B3%5Cpi%20%7D%7B9%7D%29$
Et on a :
$EGALITE TRIGONOMETRIQUE Gif.latex?S=%5Cfrac%7B1%7D%7Bsin%28%5Cfrac%7B%5Cpi%20%7D%7B9%7D%29.sin%28%5Cfrac%7B2%5Cpi%20%7D%7B9%7D%29.%29.sin%28%5Cfrac%7B4%5Cpi%20%7D%7B9%7D%29%7D%28sin%28%5Cfrac%7B%5Cpi%20%7D%7B9%7D%29.sin%28%5Cfrac%7B4%5Cpi%20%7D%7B9%7D%29+sin%28%5Cfrac%7B2%5Cpi%20%7D%7B9%7D%29$ et :
$EGALITE TRIGONOMETRIQUE Gif.latex?%5Cfrac%7B1%7D%7Bsin%5Cfrac%7B%5Cpi%20%7D%7B9%7D.sin%5Cfrac%7B2%5Cpi%20%7D%7B9%7D$
$EGALITE TRIGONOMETRIQUE Gif.latex?sin%5Cfrac%7B4%5Cpi%20%7D%7B9%7D.sin%5Cfrac%7B%5Cpi%20%7D%7B9%7D+sin%5Cfrac%7B4%5Cpi%20%7D%7B9%7D.sin%5Cfrac%7B2%5Cpi%20%7D%7B9%7D-sin%5Cfrac%7B%5Cpi%20%7D%7B9%7D$ $EGALITE TRIGONOMETRIQUE Gif$ $EGALITE TRIGONOMETRIQUE Gif$
$EGALITE TRIGONOMETRIQUE Gif$
$EGALITE TRIGONOMETRIQUE Gif$

Donc :
$EGALITE TRIGONOMETRIQUE Gif.latex?S=%5Cfrac%7B3%7D%7B4%7D$

Sujet: Re: EGALITE TRIGONOMETRIQUE Dim 21 Mar 2010, 12:26

Chapeau Sylphaen
Chapeau Thalès
Méthode de Thalès est plus facile

» Egalité trigonométrique.
» egalité
» (In)égalité
» demontrer le cas d'egalite de IAG(AM GM)
» égalité !