3 2 3 15*a *b + 3*a *b
15*a^3*b + 3*a^2*b^3
/ 2\ | b | 1*(a + 0)*|a + --|*(b + 0) \ 5 /
((1*(a + 0))*(a + b^2/5))*(b + 0)
2 / 2 \ 3*b*a *\b + 5*a/
3*b*a^2*(b^2 + 5*a)
3.0*a^2*b^3 + 15.0*b*a^3