If \tan \alpha and \tan \beta are the two real roots of the function

mx^2-2x\sqrt{7m-3}+2m=0 , find the range of \tan (\alpha +\beta)

If \tan \alpha and \tan \beta are the two real roots of the function

mx^2-2x\sqrt{7m-3}+2m=0 , find the range of \tan (\alpha +\beta)