p3−3pqp^{3}-3 p qp3−3pq
p3−3pqq3\frac{p^{3}-3 p q}{q^{3}}q3p3−3pq
q3−3pqq3\frac{q^{3}-3 p q}{q^{3}}q3q3−3pq
p3+3pqq3\frac{p^{3}+3 p q}{q^{3}}q3p3+3pq