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If $dx+dy=(x+y)(dx-dy)$ then $\log (x+y)$ is equal to:

\[\begin {array} {1 1} (a)\;x+y+c & \quad (b)\;x+2y+c \\ (c)\;x-y+c & \quad (d)\;2x+y+c \end {array}\]

(In the above , c denotes a constant ) 

1 Answer

(c) x-y+c
answered Feb 27, 2014 by meena.p
 
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