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88.Let a and b be positive integers such that (ab + 1) divides (a2 + b2). Show that (a2 + b2 )/ (ab + 1) is the square of an integer.

Answer» 88.Let a and b be positive integers such that (ab + 1) divides (a2 + b2). Show that (a2 + b2 )/ (ab + 1) is the square of an integer.


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