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Q.

If dx + dy = (x+y) (dx–dy) ⇒log (x+y) = 
 

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a

2x+y+c3

b

x+y+c 
 

c

x+2y+c 
 

d

x–y+c

answer is C.

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Detailed Solution

dx+dy=(x+y) (dx-dy) dx+dyx+y=dx-dy  d(x+y)x+y= dx-dy log (x+y)=x-y+c

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