设cosα=-√5/5 π
设cosα=-√5/5 π
设tan(5π+α)=m,求[sin(-α)-cos(π+α)]的值
设tan(5π+α)=m,则sin(α−3π)+cos(π−α)sin(−α)−cos(π+α)
设α是锐角,cos(α+π/6)=-1/3,则cosα=____,sin(α+5π/12)=____
设α使第三象限角,tan(π-α)=-5/12,则cos(3π/2-α)=
设α∈(0,π/4),sinα+cosα=7/5,则tanα=___
设α为锐角,若cos(α+π/6)=4/5,求sin(2α+π/12),
设α∈(0,π/2),若sinα=4/5,则cos(α-π/3)等于?
设α是第三象限角,tanα=5/12,则cos(π-α)等于多少?
设cos(π/4+α)=-√3/2(π/2
设α.β都是锐角,且cosα=(根号5)/5,sin(α+β)=3/5,则cosβ等于多少
设α.β都是锐角,且cosα=(根号5)/5,sin(α+β)=3/5,则cosβ等于多少.就是