cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)= cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)=
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![cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)= cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)=](/uploads/image/z/10744851-3-1.jpg?t=cos%CE%B1%3D+-17%E5%88%86%E4%B9%8B8%2C%E4%B8%94%CE%B1%E6%98%AF%E7%AC%AC%E4%BA%8C%E8%B1%A1%E9%99%90%E8%A7%92%2C%E9%82%A3%E4%B9%88cos%EF%BC%883%E5%88%86%E4%B9%8B%CF%80-%CE%B1%EF%BC%89%3D+cos%CE%B1%3D+-17%E5%88%86%E4%B9%8B8%2C%E4%B8%94%CE%B1%E6%98%AF%E7%AC%AC%E4%BA%8C%E8%B1%A1%E9%99%90%E8%A7%92%2C%E9%82%A3%E4%B9%88cos%EF%BC%883%E5%88%86%E4%B9%8B%CF%80-%CE%B1%EF%BC%89%3D)
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cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)= cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)=
cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)=
cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)=
cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)= cosα= -17分之8,且α是第二象限角,那么cos(3分之π-α)=
sinα=√[1-(cosα)^2]=15/17,(第二象限角正弦为正)
cos(π/3-α)=cosαcos(π/3)+sinαsin(π/3)
=-8/17*(1/2)+(15/17)*√3/2
=(15√3-8)/34.