sin(-4π/3)cos(-23π/6)tan(25π/4)=?
sin(-4π/3)cos(-23π/6)tan(25π/4)=?
已知tanα/2=2,1.求tan(α+π/4)的值 2.(6sinα+cosα)/(3sinα-2cosα)的值
已知tanα/2=2求tan(α+π/4)的值(6sinα+cosα)/(3sinα-2cosα)的值
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
sin(4π/3)*cos(25π/6)*tan(-3π/4)
sin(-21π/4) cos(-20π/3) tan(-19π/6)=
求值sin25π/6+cos25π/3+tan(-25π/4)+sin(-7π/3)×cos(-13π/6)-sin(-
已知tan(α+π/4)=3,求cosα+2sinα/cosα-sinα的值
已知tan(α+π/4)=2,则(2sinα+cosα)/(3cosα-2sinα)
已知tan(α+π/4)=2,求2cosα-sinα/cosα+3sinα
已知3π/4最好把tan化成sin/cos,cot化成cos/sin算,因为我是这样的,然后算得sin@cos@=-3/
已知tan(π-α)=2,求sinα-2sinαcosα-cosα/4cosα-3sinα的值