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Rapsinincke 2022-07-01 Answered
{ x arctan y = y arctan x x 2 x y + 4 y 2 = 4
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Answers (1)

Camron Herrera
Answered 2022-07-02 Author has 16 answers
Without loss of generality we may suppose that x y. But if x > y, what is the sign of ( arctan y arctan x )? conclude that x = y and finish the job.
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