Ответы на вопрос:
Cos(π/7)*cos(2π/7)*cos(4π/7)= =-sin(π/7)*cos(π/7)*cos(2π/7)*cos(4π/7)/sin(π/7)= =-sin(2π/7)*cos(2π/7)*cos(4π/7)/[2sin(π/7)]= =-sin(4π/7)*cos(4π/7)/[4sin(π/7)]=-sin(8π/7)/[-8sin(π/7)]= =-sin(π-π/7)/[8sin(π/7)]=-sin(π/7)/[8sin(π/7)]=-1/8
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