求值：cosπ/17cos2π/17cos4π/17cos8π/17
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求值：cosπ/17cos2π/17cos4π/17cos8π/17
求值:cosπ/7*cos2π/7*cos3π/7
求值cosπ/5cos2π/5cos4π/5cos8π/5
求值:cosπ/7·cos2π/7·cos4π/7
求值cos2π/5*tan5π
求值:cosπ/7cos2π/7cos3π/7cos4π/7cos5π/7cos6π/7
RT,求值cosπ/11*cos2π/11*cos3π/11*cos4π/11*cos5π/11
求值:sin(26π/3)+cos(-17π/4)=
cosπ/17cos2π/17cos4π/17cos8π/17
cosπ/17cos2π/17cos4π/17cos8π/17=___
求COSπ/5*COS2π/5
cosπ/5×cos2π/5=
COSπ/5乘以COS2π/5
cosπ/5×cos2π/5
cosπ/5cos2π/5
cosπ/5cos2π/5=?
求值：cos2π/7 * cos4π/7 * cos6π/7
求值cos2π/9*cos4π/9*8π/9