ARNOLDMONGOUE ARNOLDMONGOUE 23-11-2022 Mathématiques Answered 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]
