求证 sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/16 01:42:58
求证sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0求证sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0求证sin(x+π/3)-√3cos(2

求证 sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0
求证 sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0

求证 sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0
sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)
=sin(x+π/3)+√3cos(x+π/3)+2sin(x-π/3)
=2(sin(x+π/3)cosπ/3+cos(x+π/3)sinπ/3)+2sin(x-π/3)
=2sin(x+π/3+π/3)-2sin(x-π/3+π)
=2sin(x+2π/3)-2sin(x+2π/3)
=0

求证 sin(x+π/3)-√3cos(2π/3-x)+2sin(x-π/3)=0 求证 tan(2π-X)sin(-2π-X)cos(6π-X)/ sin(X+3π/2)*cos(X+3π/2)=-tanX 求证(3-sin^4 x-cos^4 x)/2cos^2 x=1+tan^2 x+sin^2 x 求证(tanxtan2x/tan2x-tanx)/(tan2x-tanx)+√3(sin^2x-cos^2x)=2sin(2x-π/3) 求证:1-cos^4x-sin^4x/1-cos^6x-sin^6x=2/3 三角等式求证:cos^6x+sin^6x=1-3sin^2x+3sin^4x 求证cos(3π/2+α)=sinα cos(3π/2-α)=sinα求证 已知sin[a-b]cos a-cos[b-a]sin a=3/5,b是第三象限角,求sin[b+5π/4]的值第一题1/2cos x-√3/2sin x第二题√3sin x+cos x第三题√2[sin x-cos x]第四题√2cos x-√6sin x 若函数f(x)=[2cos^3 x-sin^2 (x+π)-2cos (-x-π)+1]/[2+2cos^2(7π+x)+cos(-x)],(1)求证f(x)是偶函数若函数f(x)=[2cos^3 x-sin^2 (x+π)-2cos (-x-π)+1]/[2+2cos^2(7π+x)+cos(-x)],(1)求证f(x)是偶函数 (2)求f(π/3)的值 求证(2-2cos^6x-2sin^6x)/(3-3cos^4x-3sin^4x)-(1/4)sin^2(2x)-cos^4x=sin^2x 求证sin(x+3/1π)-根号3cos(3/2π-x)=2sin(x-3/1π)=0 若方程12x²+πx-12x=0的两的根分别是α,β,则cosαcosβ-√3sinαcosβ-√cosαsinβ-sinαsinβ= 求值:(tan10°-√3)×cos10°/sin50° 求证:[sin(2α+β)]/sinα- 2cos(α+β)=sinβ/cosα 化简cosθ+cos(θ+2π/3)+cos(θ+4π/3) 证明:sin(α+β)sin(α-β)=sin^2α-sin^2β 求证:cosα+√3·sinα=2sin(π/6+α). 需要详细过程 谢谢 求证 cos(A)+ 根号3sin(A)=2sin(π/6+A) 求证:(根号3)*sinα+cosα=2sin(α+π/6) 已知sinα+sinβ=1,求证-√3≤cosα+cosβ≤√3