cos2π/7cos4π/7cos8π/7要过程
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求值:cos2π/7cos4π/7cos8π/7
cosπ/7cos2π/7cos4π/7cos8π/7=?每步都写
cos2π/7cos4π/7cos8π/7要过程
求值cos2π/9cos4π/9cos8π/9
cos2/15π+cos4/15π+cos8/15π+cos16/15π
计算:cosπ/15×cos2π/15×cos4π/15×cos8π/15
求值:cosπ/17cos2π/17cos4π/17cos8π/17
cosπ/17cos2π/17cos4π/17cos8π/17
求值cosπ/5cos2π/5cos4π/5cos8π/5
cosπ/17cos2π/17cos4π/17cos8π/17=___
cos2/7π*cos4/7π*cos6/7π=?
求值:cos2π/7 * cos4π/7 * cos6π/7
cosπ/7cos2/7πcos4/7π=
cos2π/7+cos4π/7+6π/7=
cos2π/7cos4π/7cos6π/7=?
cos2π/7+cos4π/7+cos6π/7=
cos2/7π+cos4/7π+cos6/7=
求值:cos2∏/7*cos4∏/7*cos8∏/7请尽快作答,