Ответ:
cos(-3x+π/3)=-1/2
cos(-3x+π/3)=cos120°
-3x+π/3=2π/3
-3x=π/3
x=-π/9
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Ответ:
cos(-3x+π/3)=-1/2
cos(-3x+π/3)=cos120°
-3x+π/3=2π/3
-3x=π/3
x=-π/9