When I encounter such problems, such as the parameters of how much X equals and how much Y equals, I immediately think of squaring twice at the same time to get the structure of X and Y, and then adding the two formulas, I can basically get the rectangular coordinate equation. What equation do you get? Do you still need to observe? Calculation is the only criterion for testing truth. Even if it is to be converted into a polar coordinate equation, it is very simple, because X +y = P, the polar coordinate equation can be directly simplified. The specific answer is shown in the figure.