If  then 

The correct answer is: 4

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

Hence, the value of limit is .