Translate each equation into polar coordinates.
Rearranging, and remembering that we can replace x2 + y2 with r2, we find
Since we have r2 and r terms, it's not reasonable to isolate r by itself.
If r≠ 0 then we can divide both sides by r to find
It's reasonable to separate out r2 in this equation. Remember that factoring r2 out from r2 leaves 1 behind.