设α为锐角 若cos (α+π/3)=1/5则cos(α-π/6)=
设α是锐角,cos(α+π/6)=-1/3,则cosα=____,sin(α+5π/12)=____
设α为锐角,若cos(α+π/6)=4/5,求sin(2α+π/12),
设α为锐角,且sinα=3cosα,则sinα×cosα的值等于?
设a为锐角,若cos(a+π/6)=3/5,则sin(a-π/12)=
若α为锐角,sin(α -6/π )=1/3,则cosα 的值为———
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)=
已知α为锐角,且cos(α+π6)=45,则cosα的值为( )
已知α为锐角,且cos(α+π/6)=5/13,求cosα的值
设α为锐角,tanα=3 求(cosα-sinα)/cosα+sinα)
设a为锐角,若cos(a+π/6)=3/5,则sin(a–π/12)的值为?
已知α,β为锐角,cosα=4/5,tan(α-β=-1/3),求cosβ