Математика. Распишите подробно решение уравнения
cos([tex] \pi x/9[/tex])×cos([tex] 2\pi x/9[/tex])×cos([tex] 4\pi x/9[/tex])=1/8
cos([tex] \pi x/9[/tex])×cos([tex] 2\pi x/9[/tex])×cos([tex] 4\pi x/9[/tex])=1/8
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