Brian Alliet found this sign combination in Henrietta, New York.
Mr. Alliet showed quick-whits and a good trigonetry background here. Realizing the special relationship in the numbers he concludes.
\sin(390-15)^\circ = \sin 15^\circ
This sign is on NY 252 eastbound at the junction with NY 15A in Henrietta, New York. See sign on map!
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