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Cliique
@Cliique
April 2019
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Sin ( 5x-pi/4)=cos(x+pi/8)
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Sin ( 5x-pi/4)=cos(x+pi/8)comme cos(pi/2 -x)=sinx
cos (pi/2- 5x+pi/4)=cos(x+pi/8)
donc
cos (3pi/4- 5x)=cos(x+pi/8)
soit
3pi/4- 5x=x+pi/8 +2k pi
ou 3pi/4- 5x=-x-pi/8+2k pi
soit
x=5 pi /48 + k.pi/3
ou
x=7 pi /32+k . pi/2
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Lista de comentários
cos (pi/2- 5x+pi/4)=cos(x+pi/8)
donc
cos (3pi/4- 5x)=cos(x+pi/8)
soit
3pi/4- 5x=x+pi/8 +2k pi
ou 3pi/4- 5x=-x-pi/8+2k pi
soit
x=5 pi /48 + k.pi/3
ou
x=7 pi /32+k . pi/2