1.已知cos（a-π/6)+sina=4/5根号3.则sin(a-7π/6)的值是____
2.已知f（x）=sin(wx+π/3)(w>0),f(π/6)=f(π/3)且f(x)在区间（π/6,π/3）有最小值,则w=___
3.设x∈（0,π/2）,则函数y=[2(sinx)^2+1]/sin2x的最小值为____
4.若cosa+2sina= 负根号5,则tana=____
5.函数f(x)=(sinx-1)/根号(3-2cosx-2sinx) (0 1.已知cos（a-π/6)+sina=4/5根号3.则sin(a-7π/6)的值是____
2.已知f（x）=sin(wx+π/3)(w>0),f(π/6)=f(π/3)且f(x)在区间（π/6,π/3）有最小值,则w=___
3.设x∈（0,π/2）,则函数y=[2(sinx)^2+1]/sin2x的最小值为____
4.若cosa+2sina= 负根号5,则tana=____
5.函数f(x)=(sinx-1)/根号(3-2cosx-2sinx) (0