化简cos(π/9)cos(2π/9)cos(3π/9)cos(4π/9)=( ).请说明理由哦、

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化简cos(π/9)cos(2π/9)cos(3π/9)cos(4π/9)=().请说明理由哦、化简cos(π/9)cos(2π/9)cos(3π/9)cos(4π/9)=().请说明理由哦、化简co

化简cos(π/9)cos(2π/9)cos(3π/9)cos(4π/9)=( ).请说明理由哦、
化简cos(π/9)cos(2π/9)cos(3π/9)cos(
4π/9)=( ).
请说明理由哦、

化简cos(π/9)cos(2π/9)cos(3π/9)cos(4π/9)=( ).请说明理由哦、
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