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cosπ/17*cos2π/17*cos4π/17*cos8π/17=_____

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解决时间 2021-03-19 03:57
  • 提问者网友:暮烟疏雨之际
  • 2021-03-18 03:34
cosπ/17*cos2π/17*cos4π/17*cos8π/17=_____
最佳答案
  • 五星知识达人网友:孤老序
  • 2021-03-18 04:22
原式=【sinπ/17*cosπ/17*cos2π/17*cos4π/17*cos8π/17】/sinπ/17
=【1/2*sin2π/17cos2π/17cos4π/17cos8π/17】/sinπ/17
=【1/4sin4π/17*cos4π/17*cos8π/17】/sinπ/17
=【1/8sin8π/17*cos8π/17】/sinπ/17
=1/16sin16π/17/sinπ/17=1/1

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  • 1楼网友:长青诗
  • 2021-03-18 06:06
原式=【sinπ/17*cosπ/17*cos2π/17*cos4π/17*cos8π/17】/sinπ/17 =【1/2*sin2π/17cos2π/17cos4π/17cos8π/17】/sinπ/17 =【1/4sin4π/17*cos4π/17*cos8π/17】/sinπ/17 =【1/8sin8π/17*cos8π/17】/sinπ/17 =1/16sin16π/17/sinπ/17=1/16
  • 2楼网友:你哪知我潦倒为你
  • 2021-03-18 05:36
cosπ/17*cos2π/17*cos4π/17*cos8π/17=(sinπ/17cosπ/17*cos2π/17*cos4π/17*cos8π/17)/sinπ/17=(1/2sin2π/17cos2π/17*cos4π/17*cos8π/17)/sinπ/17
=sin16π/17/16sinπ/17
=1/16
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