Question:-
My approach:-
After this I can't able to solve this question
Correct options are $B & C$.
Is there any other approach to solve this tough question.? Thank You in advance for your time.
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I saw the same question yesterday on this site. Can't seem to find it again. – Paras Khosla Mar 17 '19 at 07:48
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Question may be deleted from this site ? Can you solve this problem – Mar 17 '19 at 07:55
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Duplicate of https://math.stackexchange.com/questions/3150431/how-to-solve-this-challenging-limit/3150610#3150610 – Paras Khosla Mar 18 '19 at 04:53
1 Answers
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Hint:-
Put $xy= k$
After you finally get a expersion like this
$\frac{f'(x)}{f(x)}$=$ln(\frac{1+x}{1+x^2})$
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