admin百科知識 2022-02-13 19:10:07 已知cos(π6+α)=23 ,求sin(α-2π3)的值.已知cos(π/6+α)=2/3 ,求sin(α-2π/3)的值.網友廻答:匿名網友將已知變形:cos(π/6+α)=cos(π/2-(π/3-α))=sin(π/3-α)=2/3將求的式子變形:sin(α-2π/3)=sin(π-(α-2π/3))=sin(π/3-α)=已知=2/3 db標簽 生活常識_百科知識_各類知識大全»已知cos(π6+α)=23 ,求sin(α-2π3)的值.
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