If  then 

The correct answer is:

In this question we are  and we have to find the value of 
Step1: Putting the value of limit
By putting the value of limit we are getting both numerator and denominator as zero. That is  form.
Step2: Using L'Hôpital's rule
By differentiating both numerator and denominator we get

=> 
We have to find the value of 
Step3: Finding the value of .

=> 
by putting the value of ,

=>