化简cosα+cos(120°-α)+cos(120+α)
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化简cosα+cos(120°-α)+cos(120+α)化简cosα+cos(120°-α)+cos(120+α)化简cosα+cos(120°-α)+cos(120+α)cosα+cos(120°
化简cosα+cos(120°-α)+cos(120+α)
化简cosα+cos(120°-α)+cos(120+α)
化简cosα+cos(120°-α)+cos(120+α)
cosα+cos(120°-α)+cos(120+α)
=cosα+(cos120cosα+sin120sinα)+(cos120cosα-sin120sinα)
=cosα+cos120cosα+sin120sinα+cos120cosα-sin120sinα
=cosα+2*cos120cosα
=cosα+2*cos(90+30)cosα
=cosα+2*(-1/2)cosα
=cosα+(-cosα)
=0
等于0
cos²α+cos²(120°-α)+cosαcos(120°-α)化简cos²α+cos²(120°-α)+cosαcos(120°-α)
化简cosα+cos(120°-α)+cos(120+α)
cos²α+cos²(120°-α)+cosαcos(120°-α) cos²α+cos²(120°-α)+cosαcos(120°-α)
用C(α+β)推导公式cos(180°-α)=-cosα
求cosα+cos(120°-α)的最大值
化简:cos(60-α)-cos(60+α)
化简:cos(-π-α)
cos^2α+cos^2(α+π/3)-cosαcos(α+π/3)化简
cosα
求证:|cosα+cosβ|
【2cos³α-cos²α+cosα-2】/2cos²α+cosα+2化简
化简cos(A-C)
化简(1+cosα+cos2α+cos3α)/(2cos²α+cosα-1)
已知α是锐角,化简,√Cos^2α-4Cosα+4-(1-Cosα)的绝对值
(sinα+cosα)^2化简
化简cos(60°+α)=
化简(1-sinα+cosα/1-sinα-cosα )+(1-sinα-cosα/1-sinα+cosα)
化简 cos²(π+α)