cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
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cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)cos(π/17)*cos(2π
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
答案是:1/16
解题的方法是:乘以2sin(π/17),除以2sin(π/17),利用二倍角公式再进行类似的进行就可以解决问题.
cos(π/17)*cos(2π/17)*cos(4π/17)*cos(8π/17)
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