Please solve..............
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xdx+ydy+(xdy-ydx)/x sq.+y sq.
d(x sq.+ y sq.)+[dxy(1-1)]/x sq. + y sq.
d(x sq +y sq.)+[ dxy(0)]/ x sq +y sq
d(x sq +y sq)+0
=d(x sq +y sq ) is answer
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