If f(x, y) = xy, then the differential df is equal to

1.	If f(x, y) = xy, then the differential df is equal to
A.	xdx + ydy
B.	ydx + xdy
C.	dx + dy
D.	dx - dy
Answer» C. dx + dy

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If f(x, y) = xy, then the differential df is equal to

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