montrer que A(x)= [tex] \sin6\pi \div 7 = 2 \sin(\pi \div 7)( \cos(\pi \div 7) + \cos(3\pi \div 7 ) + \cos(5\pi \div 7) ) [/tex]
Mathématiques
arnoldmongoue
Question
montrer que A(x)=
[tex] \sin6\pi \div 7 = 2 \sin(\pi \div 7)( \cos(\pi \div 7) + \cos(3\pi \div 7 ) + \cos(5\pi \div 7) ) [/tex]
[tex] \sin6\pi \div 7 = 2 \sin(\pi \div 7)( \cos(\pi \div 7) + \cos(3\pi \div 7 ) + \cos(5\pi \div 7) ) [/tex]
