若sin(π/6-α)=-1/3,且3π/4

已知sinα=1/3,且2π 若sin(π/6-α)=-1/3,且3π/4 若α是锐角,且sin(α-π/6)=1/3,则COSα= 若α是锐角,且sin(α-π/6)=1/3,求cos2α 已知β∈[-π/6,π/4）,且3（sinα）^2-2（sinβ）^2=2sinα,求（sinβ）^2-1/2sinα的最小值 已知α,β∈(0,π/2),且2tanα+3sinβ=7,tanα-6sinβ=1,则sinα= 已知α∈(0,π|2）,2tanα+3sinβ=7,且tanα-6sinβ=1,求sinα的值 若角α为锐角,且sin(a-π/6)=1/3,则cosα=? 若a是锐角,且sin(x-π/6)=1/3,则cosx等于? 已知sinα=3/5且π/2 已知sin(π/12-a)=1/3,且-π 设α,β,γ∈(0,π/2)且(sinα)^2+(sinβ)^2+(sinγ)^2=1求函数y=(sinα)^3/sinβ+(sinβ)^3/sinγ+(sinγ)^3/sinα 的最小值. 已知sin(π/3-x)=-1/5,且0 若α是锐角,且满足sin（α-π/6）=1/3,求cosα的值 若α是锐角,且sin(α-π/6)=1/3,则cosα的值是_________. 已知sinα=1/3,且α是第二象限角 求sin(α-π/6)的值.求cos2α的值 若sin(3π-α)=(根号2)sin(2π+β),(根号3)cos(-α)=(-根号2)cos(π+β),且0＜α＜π,0＜β＜π,求sinα,sinβ的值 若sin(3π-α)=根号2sin(2π+β)已知sin(3π-α)=根号2 sin(π-β),根号3 cos(-α)= - 根号2 cos(π+β) 且0