已知方程2x²-(根号3+1)x+m=0的两个根分别为sinθ,cosθ,求[sin(π-θ)×tan(π+θ)/tanθ-1]+[cos(2π-θ)/1-tanθ]

x1+x2=-b/a,x1*x2=c/a所以sinθ+cosθ=（√3+1）/2sinθ*cosθ=m/2(sinθ+cosθ)²=1+√3/2即：sin²θ+cos²θ+2sinθ*cosθ=1+√3/21+m=1+√3/2m=√3/2又因为sin(π-α) = sinαtan（π+α）=tanαcos...