If x^my^n = (x + y)^(m+n), then (dy/dx)(...

If `x^my^n = (x + y)^(m+n)`, then `(dy/dx)_(x=1, y=2)` is equal to

A

`1//2`

B

2

C

`2 m//n`

D

`m//2n`

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The correct Answer is:

B

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