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*cos3π/7
求值:cosπ/7cos2π/7cos3π/7cos4π/7cos5π/7cos6π/7
求值:cos2π/7 * cos4π/7 * cos6π/7
求值:cos2π/7cos4π/7cos8π/7
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cosπ/7cos2π/7cos3π/7=?
cosπ/7cos2/7πcos4/7π=
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求证cos2π/7+cosπ/3=cosπ/7+cos3π/7
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COS(π/7)+COS(3π/7)+COS(5π/7)化简求值,
化简求值cos(π/7)cos(2π/7)cos(4π/7)