KöMaL 2025 A897

Let $O$ denote the origin and let $\gamma$ be the circle with center $(1,0)$ and radius 1 in the Cartesian system of coordinates. Let $\lambda$ be a real number from the interval $(0,2)$, and let the line $x=\lambda$ intersect the circle $\gamma$ at points $P$ and $Q$. The lines $OP$ and $OQ$ intersect the line $x=2-\lambda$ at the points $P'$ and $Q'$, respectively. Let $\mathcal{G}$ denote the locus of such points $P'$ and $Q'$ as $\lambda$ varies over the interval $(0,2)$. Prove that there exist points $R$ and $S$ different from the origin in the plane such that for every $A\in \mathcal{G}$ there exists a point $A'$ on line $OA$ satisfying $A'R^2=(A'S-OS)^2=A'A\cdot A'O.$