How to derive the solutions (a,b,c) = (r^2-s^2, r^2-2rs, s^2-rs+r^2) to the Diophantine equation a^2-ab+b^2=c^2?

Anonymous2017-12-12T00:03:58Z

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I solved this problem at /question/index?qid=20171211211245AA45qjO