( 2x + m|tanx| ) / [ √(x^2 + x+1) - 1 ]
m = ?
2x + m|tanx| ) / [ √(x^2 + x+1) - 1 ] m=?
m = -(2 x)/(abs(tan(x))) and tan(x)!=0 and sqrt(x^2+x+1)!=1