Ответ:
cos2x(1-2cos6x)
Объяснение:
cos4x=cos(6x-2x)=cos6xcos2x+sin6xsin2x
cos8x=cos(6x+2x)=cos6xcos2x-sin6xsin2x
cos2x-cos6xcos2x-sin6xsin2x-cos6ccos2x+sin6xsin2x=cos2x-2cos6xcos2x=
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Ответ:
cos2x(1-2cos6x)
Объяснение:
cos4x=cos(6x-2x)=cos6xcos2x+sin6xsin2x
cos8x=cos(6x+2x)=cos6xcos2x-sin6xsin2x
cos2x-cos6xcos2x-sin6xsin2x-cos6ccos2x+sin6xsin2x=cos2x-2cos6xcos2x=
cos2x(1-2cos6x)