### Home > PC > Chapter 11 > Lesson 11.2.1 > Problem 11-72

11-72.

Multiply both sides of the equation by *r*^{2}.

Substitute the polar coordinate conversions.

(*x*^{2} + *y*^{2})^{2} = *xy*

Multiply both sides of the equation by sin *θ*.

11-72.

Multiply both sides of the equation by *r*^{2}.

Substitute the polar coordinate conversions.

(*x*^{2} + *y*^{2})^{2} = *xy*

Multiply both sides of the equation by sin *θ*.