Ответы на вопрос:
Cosπ/7*cos4π/7*(-cos2π/7)=(-sinπ/7*cosπ/7*cos2π/7*cos4π/7)/sinπ/7= =(-sin2π/7*cosπ/7*cos2π/7*cos4π/7)/2sinπ/7=(-sin4π/7*cos4π/7)/4sinπ/7= =(-sin8π/7)/8sinπ/7=(-sinπ/7)/8sinπ/7=-1/8
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