(c^3/2)/(c^1/2+b^1/2)-(c*b^1/2)/(b^1/2-c^1/2)+(2c^2-4cb)/(c-b)=
(c^3/2)/(c^1/2+b^1/2)+(c*b^1/2)/(c^1/2-b^1/2)+(2c^2-4cb)/(c-b)=
((c^3/2)*(c^1/2-b^1/2)+(c*b^1/2)*(c^1/2+b^1/2))/(c-b)+(2c^2-4cb)/(c-b)=
(C^2-c^3/2*b^1/2+c^3/2*b^1/2+c*b)/(c-b)+(2c^2-4cb)/(c-b)=
((c^2+cb)+2c^2-4cb)/(c-b)=(3c^2-3cb)/(c-b)=(3c*(c-b))/(c-b)=3c