Photos 2 DX DY

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2 dx dy. Dy=(x+1)DX. Dy/x-1=DX/Y-2. Dy/DX-2y/x+1 x+1 3. Dy/DX+2y/x=1/x^2.
Dy=(x+1)DX. Dy/x-1=DX/Y-2. Dy/DX-2y/x+1 x+1 3. Dy/DX+2y/x=1/x^2.

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