E748 -- Investigatio quadrilateri, in quo singulorum angulorum sinus datam inter se teneant rationem, ubi artificia prorsus singularia in Analysi Diophantea occurrunt

(Translate title)


Somehow, he reduces this to the Diophantine problem: Given four square numbers aa, bb, cc, and dd, to find two numbers z and v such that z - aav, z - bbv, z - ccv and z - ddv all make square numbers.

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