基本初等函數(shù)與圖像大全-資料下載頁
2025-05-13 23:13本頁面
【正文】 )/2cosa*sinb=(sin(a+b)sin(ab))/2cosa*cosb=(cos(a+b)+cos(ab))/2sina*sinb=(cos(a+b)cos(ab))/2和差化積sinx+siny=2sin((x+y)/2)*cos((xy)/2)sinxsiny=2cos((x+y)/2)*sin((xy)/2)cosx+cosy=2cos((x+y)/2)*cos((xy)/2)cosxcosy=2sin((x+y)/2)*sin((xy)/2)
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