已知sin(α+π/6)=1/3,则cos(2α+π/3)=?sin(π/6-2α)=?
已知(3sinα+cosα)/(3cosα-sinα)=2,则2-3sin(α-3π)sin(1.5π-α)-[cos(
化简:1、sin(x-π/3)-cos(x+π/6)+√3cosx=?2、已知,sinα+sinβ=√2/2,求cosα
已知3sinα=cosα,则sinα-2sinαcosα+3cosα+1=
已知sin(3π−α)=−2sin(π2+α),则sinαcosα=( )
已知tan(3π+α)=2,求:1、(sinα+cosα)²;2、sinα-cosα/2sinα+cosα
已知(sinα-cosα)/(sinα+cosα)=1/3,则cos^4(π/3+α)-cos^4(π/6-α)的值为
已知6sin^2α+sinαcosα-cos^2α=0,求sin(2α+π/3)的值
已知tanα=2,sinα+cosα<0,求[sin(2π-α)*sin(π+α)*cos(-π+α)]/[sin(3π
已知tan(α+π/4)=2,则(2sinα+cosα)/(3cosα-2sinα)
1.已知cos(π/6-α)=1/3,求sin(2/3π-α) 2.求证tan^2α-sin^2α=tan^2α-sin
已知cos(π\3-2)=1\3,则cosα+根号3sinα=
已知sin(2π-α)=45,α∈(3π2,2π),则sinα+cosαsinα-cosα等于( )