sin(-4π/3)= cos(-79π/6)= cos13π/6=
已知(sinα-cosα)/(sinα+cosα)=1/3,则cos^4(π/3+α)-cos^4(π/6-α)的值为
化简:sin(π/4-α)cos(π/3-α)-cos(π/6+α)sin(π/4+α)=
cosπ/6+根号3sinπ/6=?
化简:cos(π/3+a)+sin(π/6)+a=
已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcos
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
函数规律sin^2 π/6+cos^2 π/3+sin π/6 cosπ/3=3/4sin^2 π/9+cos^2 5π
化简:1、sin(x-π/3)-cos(x+π/6)+√3cosx=?2、已知,sinα+sinβ=√2/2,求cosα
sin²α+√3sinαcosα-2cos²α=0,α∈(π/6,5π/12),求:(1)sin(2
已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)
已知α∈(0,π/2),且2sinα-sinαcosα-3cosα=0.求[sin(α+π/4)]/[sin2α+cos
已知6sin^2α+sinαcosα-cos^2α=0,求sin(2α+π/3)的值