作业帮化简cos(2π/3-x)+cos(2π/3+x)+cosx
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/08 15:06:30
x){3b
ƺp6SaTOB;$B\\$]Yڨ0ctA*QCEm4 j,dy<;hxـ9
}#G `N"D# <
化简cos(2π/3-x)+cos(2π/3+x)+cosx
化简cos(2π/3-x)+cos(2π/3+x)+cosx
化简cos(2π/3-x)+cos(2π/3+x)+cosx
cos(2π/3-x)+cos(2π/3+x)+cosx
= cos(2π/3)cosx+sin(2π/3)sinx+cos(2π/3)cosx-sin(2π/3)sinx+cosx
= -cos(π/3)cosx+sin(π/3)sinx-cos(π/3)cosx-sin(π/3)sinx+cosx
= -cos(π/3)cosx-cos(π/3)cosx+cosx
= -(1/2)cosx-(1/2)cosx+cosx
= 0
cos(2π/3-x)+cos(2π/3+x)+cosx
=-cosx/2+√3/2sinx-cosx/2-√3/2sinx+cosx
=0
cos(-x-2π) 和cos(π-x) 化简
cos^2α+cos^2(α+π/3)-cosαcos(α+π/3)化简
化简cos(2π/3-x)+cos(2π/3+x)+cosx
cos(2x-π/3）+cos（2x+π/6）化简
化简cos(π/2-x)cos(π/2+x)cot(π-x)/sin(3π/2+x)cos(3π+x)tan(π+x)
化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π)
化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π)
证明:函数f(x)=cos^2+cos^2(x+π/3)+cos^2(x-π/3)是常数函数
化简sin2x-cos(2x+π/6)
根号2cos(x-π/4)化简
计算：cos（π/5)+cos（2π/5)+cos(3π/5)+cos(4π/5)
cos (π/3-2x) 求导
y=cos(π/3-x)cos[π/2（x-1)]判断奇偶性y=cos(π/3-x)cos(π/3+x)判断奇偶性
化简f(x)=cos(2x-π/3)-cos2x
化简:cosα+cos(2π/3-α)+cos(2π/3+α)
化简cosθ+cos(θ+2π/3)+cos(θ+4π/3)
化简cos 2x
证明cos 2x cos x=1/2(cos x+cos 3x)