设α是锐角,cos(α+π/6)=-1/3,则cosα=____,sin(α+5π/12)=____
设α是锐角,cos(α+π/6)=-1/3,则cosα=____,sin(α+5π/12)=____
cos(π/3-α)=1/8,则cosα+(根号3)sinα的值为____
sin(α-Π/6)=1/3,α是锐角,求cosα
设α为锐角,且sinα=3cosα,则sinα×cosα的值等于?
设α为锐角,若cos(α+π/6)=4/5,求sin(2α+π/12),
若α是锐角,且sin(α-π/6)=1/3,则cosα的值是_________.
设α为锐角,tanα=3 求(cosα-sinα)/cosα+sinα)
1.若α是锐角,sinα+cosα=4/3,则sinα+cosα=________.
若a是锐角,sinα+cosα等于3分之四,则sinα×cosα=?
设α为锐角,若cos(α+π/6)=4/5,则sin(2α+π/12)=?
(江苏2012)设α为锐角,若cos(α+π/6)=4/5,则sin(2α+π/12)=
sin cos三角函数题解已知α为锐角 sinα=3cosα 求sinαcosα