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Question: Answered & Verified by Expert
In order that the function $f(x)=(x+1)^{1 / x}$ is continuous at $x=0, f(0)$ must be defined as
MathematicsContinuity and DifferentiabilityJEE Main
Options:
  • A $f(0)=0$
  • B $f(0)=e$
  • C $f(0)=1 / e$
  • D $f(0)=1$
Solution:
2996 Upvotes Verified Answer
The correct answer is: $f(0)=0$
Here $\lim _{x \rightarrow 0^+} f(x)=k, \lim _{x \rightarrow 0^-} f(x)=-k$ and $f(0)=k$
But $f(x)$ is continuous at $x=0$, therefore $k$ must be zero.

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