Let $r>0$ be a rational number. There is a criterion for determining whether the equation $x^2+y^2=r$ has a solution in rational numbers, and if we have one solution, then there is a way to generate all solutions. However, how does one find the first solution?
2026-05-16 14:31:10.1778941870
Solving $x^2+y^2=r$
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