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If x^m y^n=(x+y)^(m+n), prove that (d^2...

If `x^m y^n=(x+y)^(m+n)`, prove that `(d^2y)/(dx^2)=0`

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Given: `x^my^n=(x+y)^(m+n)`
Take log on both side
`logx^m+logy^n+(m+n)log=y(x+y)`
`mlogx+nlogy=(m+n)log(x+y)`
Differentiating w.r.t x on both sides we get, ...
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