tan(-35π/6)·sin(-46π/3)-cos(37π/6)·tan(55π/6)=?
若α∈(0,π/6) 比较tan(sinα),tan(cosα),tan(tanα)的大小
cosπ/3+tanπ/4+3tan²π/6+sinπ/2+cosπ+sin3π/2等于?.
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
1.已知cos(π/6-α)=1/3,求sin(2/3π-α) 2.求证tan^2α-sin^2α=tan^2α-sin
sin(-4π/3)cos(-23π/6)tan(25π/4)=?
sin(-21π/4) cos(-20π/3) tan(-19π/6)=
SIN(-7/6π),cos(15/4π),tan(-8/3π),tan(33/4π)
求证tan(2π-α)sin(-2π-α)cos(6π-α)/cos(α-π)sin(5π-α)=-tanα
求证(tan(2π-θ)sin(2π-θ)cos(6π-θ))/((-cosθ)sin(5π+θ))=tanθ
若tanθ=根号3/3,则cos^2θ-sin(θ+π/6)cosθ的值
三角函数sin、cos、tan的π/几都可以化成分数·比如sinπ/3=根号3/2那其他的π/6、π/12呢