Photos 2 DX DY

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2 dx dy. (XY+X)DX/dy=1. XY DX 1+X 2 dy. Dy/DX+Y/X -XY 2. Dy/x-1=DX/Y-2.
(XY+X)DX/dy=1. XY DX 1+X 2 dy. Dy/DX+Y/X -XY 2. Dy/x-1=DX/Y-2.

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