A) [tex3]2^{-4}[/tex3] [sen(2x) + sen(5x) + sen(7x)]
B) [tex3]2^{-4}[/tex3] [2sen x + sen(7x) - sen(9x)]
C) [tex3]2^{-4}[/tex3] [ -sen(2x) - sen(3x) + sen(7x)]
D) [tex3]2^{-4}[/tex3] [-senx + 2sen(5x) - sen(9x)]
E) [tex3]2^{-4}[/tex3] [sen x + 2sen(3x) + sen(5x)]
Resposta
resp:B