Q .     If `xy!=0,x+y!=0 and x^my^n=(x+y)^(m+n) ` where `m`, `n` in `N` then `dy/dx=`

EAMCET 2012
A

`y/x`

B

`(x+y)/(xy)`

C

`xy`

D

` x/y`

HINT

Taking log both side and differentiate with respect to x.
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