∫(（x+2）/√(x^-2x+4))dx
=1/2*∫(（2x-2+6）/√(x^-2x+4))dx
=1/2*∫(1/√(x^-2x+4))d(x^-2x+4)+3*∫(1/√(x^-2x+4))dx
=√(x^-2x+4)+3*arcsin((x-1)/√3)+C