Exercice à rendre demain :
Calculer Cette expression :
a) [tex]cos^{2} (\frac{\pi }{8} ) +cos^{2} (\frac{3\pi }{8} ) +cos^{2} (\frac{5\pi}{8}) +cos^{2} (\frac{7\pi}{8})[/tex]
Calculer Cette expression :
a) [tex]cos^{2} (\frac{\pi }{8} ) +cos^{2} (\frac{3\pi }{8} ) +cos^{2} (\frac{5\pi}{8}) +cos^{2} (\frac{7\pi}{8})[/tex]
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