sin13π/6+cos13π/3-tan(-23π/4)=
①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°
对任意实数x,y∈R,恒有sinX+cosY=2sin(x-y/2 π/4)cos(x y/2-π/4),则sin13π
计算:sin43°cos13°-sin13°cos43°的值等于( )
tan=3,π
tan(a+b)=3/4,tan(a-π/4)=1/2,那么tan(b+π/4)等于多少
已知tan a=3,求tan(a+π/4),tan(a-π/4)的值?
求y=3tan(π6
化简tan2αtan(π/6-α)+tan2αtan(π/3-α)+tan(π/6-α)tan(π/3-α)=?请写下过
求值tan(π/6-θ)+tan(π/6+θ)+√3tan(π/6-θ)tan(π/6+θ)
tan(a+π4
tan(π/6-2)=根号3/2,求tan(5π/6+2)的值
若tan(α+π/4)=-3/5,求tan(α-π/4)的值