Actually xdy+ydx=d(xy)
like that dx+dy=_________???
like that dx+dy=_________???
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dx + dy = d( x+y ) ............. Ans.
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Some More :
dx - dy = d( x - y )
x dy - y dx = x² · d(y/x), ...
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Some More :
dx - dy = d( x - y )
x dy - y dx = x² · d(y/x), ...
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It depends on problem which is asked. No meaning of dx+dy.