(1/x-1 - 1/x1)/ x/2x22-2
=(x/x2-x - x-1/x2-x )×2x2-2/x
=1/x2-x × 2x2-2/x
=1/x(x-1) ×2(x-1)(x+1)
=2(x+1)/x2
=2x+2/x2