E(x) = [x/(x+2) + 2x/(x-2) + (x²+2x+1)/(x²-4)] : (2x+1)/(x+2) amplifici pe prima fratie cu x-2 si pe a doua cu x+2
E(x) = [(x²-2x+2x²+4x+x²+2x+1)/(x²-4)] : (2x+1)/(x+2)
E(x) = (4x²+4x+1)/(x²-4) * (x+2)/(2x+1)
E(x) = (2x+1)²/(x-2)(x+2) * (x+2)/(2x+1)
E(x) = (2x+1)/(x-2)
