作业帮求值:cosπ/7·cos2π/7·cos4π/7
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求值:cosπ/7·cos2π/7·cos4π/7
求值:cosπ/7·cos2π/7·cos4π/7
求值:cosπ/7·cos2π/7·cos4π/7
cosπ/7·cos2π/7·cos4π/7
=sinπ/7*cosπ/7*cos2π/7*cos4π/7 / sinπ/7
=sin2π/7*cos2π/7*cos4π/7 / 2sinπ/7
=...
=sin8π/7 / 8sinπ/7
=-sinπ/7 / 8sinπ/7
=-1/8.
求值:cosπ/7·cos2π/7·cos4π/7
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