若α是锐角,且满足sin(α-π/6)=1/3,则cos阿尔法的值为多少 thanks!

若α是锐角,且满足sin（α-π/6）=1/3,求cosα的值 若α是锐角,且满足sin(α-π/6)=1/3,则cos阿尔法的值为多少 thanks! 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 若a是锐角,且满足sin(a-π/6)=1/3,则cos a 的值为多少? 若A是锐角,且满足sin(A-(π/6））=1/3则cosA的值 若α是锐角,且sin(α-π/6)=1/3,则cosα的值是_________. 若x是锐角,且满足sin(x-pai/6)=1/3,则cosx等于多少 若α,β为锐角,且满足cosα=4／5,cos（α+β）=3／5,则sinβ的值是 若a是锐角,且满足sin(a-π/6)=1/3,则cos a 的值为多少?(希望能写出答题步骤) α为锐角,且满足sinα=3cosα,则sinαcosα= 已知α为锐角,且满足sinα=3cosα求sinαcosα的值 α为锐角,且满足sinα=3cosα,求sinα·cosα的值 已知α β都是锐角且满足sinβ=sinα cos(α +β)若α +β=45度 则TANβ= 若α是锐角,且cos(α+45°)=-1/3,则sinα= 若a是锐角,且sin(x-π/6)=1/3,则cosx等于? 若α是锐角,且cos（α+π/4）=-1/3,则sinα= 若A是锐角,且满足sin(A-30)=1/3,则cosA的值为