यदि f(x) = In(x) है, तब 

\(\displaystyle\lim _{m \rightarrow 0}\left[\displaystyle\lim _{n \rightarrow 0} \frac{f(2+m+n)-f(2+m)-f(2+n)+f(2)}{m n}\right]\) का मान है:

1
\(\frac{1}{4}\)
2
\(\frac{1}{3}\)
3
1
4
\(-\frac{1}{4}\)

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