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If e^(x) +e^(y) =e^(x+y),then (dy)/(dx)...

If ` e^(x) +e^(y) =e^(x+y),then (dy)/(dx)=`

A

`e^(y-x)`

B

`e^(x+y)`

C

`-e^(y-x)`

D

`2 e^(x-y)`

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