化简:cos(60-α)-cos(60+α)
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化简:cos(60-α)-cos(60+α)化简:cos(60-α)-cos(60+α)化简:cos(60-α)-cos(60+α)cos(60-a)-cos(60+a)=cos60cosa+sin6
化简:cos(60-α)-cos(60+α)
化简:cos(60-α)-cos(60+α)
化简:cos(60-α)-cos(60+α)
cos(60-a)-cos(60+a)
=cos60cosa+sin60sina-[cos60cosa-sin60sina]
=2sin60sina
=根号3*sina
cos(60-α)-cos(60+α)
=-2sin[(60-α+60+α)/2]*sin(60-α-60+α)/2]
=-2sin60sin-α
=√3*sinα
cos(60-α)-cos(60+α)
=cos60cosa+sin60sina-cos60cosa+sin60sina
=2sin60sina
=√3sina
和差化积
化简:cos(60-α)-cos(60+α)
cos(40)*cos(60)*cos(160)
化简cos(60°+α)=
化简:cos(60°-a)-cos(60°+a)=
化简:cos(60°+a)-cos(60°-a)
怎样化简cosαcos(60°-α)+1
化简:cos^2a-cos(a+60)cos(a-60)=
化简:cos^2A+cos^2(60°+A)+cos^2(60°-A)
cos^2A+cos^2(A+60)-cosA*cos(A+60) 化简
化简:cos(-π-α)
cos^2α+cos^2(α+π/3)-cosαcos(α+π/3)化简
sin30 60 45 cos
Cos(-60°)=?
cos 60°是多少
cos
【2cos³α-cos²α+cosα-2】/2cos²α+cosα+2化简
cos²(40°+α)+cos²(30°-α)+cos²(50°+α)×tan(60°-α)急急帮帮忙cos²(40°+α)+cos²(30°-α)+cos²(50°+α)×tan(60°-α)
化简 {sin(60+α )+cos120sinα}/cosα