(m+m^-1+2)/(m^-1/2+m^1/2)*(m^-3/2-m^3/2)/(m+m^-1+1)=(m^1/2+m^-1/2)^2/(m^-1/2+m^1/2)*(m^-1/2-m^1/2)*(m+m^-1+1)/(m+m^-1+1)=(m^1/2+m^-1/2)*(m^-1/2-m^1/2)=m^-1-m=1/m-m
