Do you will need to know that for what.
        
             
        
        
        
It’s letter B bro because
        
             
        
        
        
Step-by-step explanation:
definition of the derivative to differentiate functions. This tutorial is well understood if used with the difference quotient .
The derivative f ' of function f is defined ascthe above pic.
when this limit exists. Hence, to find the derivative from its definition, we need to find the limit of the difference quotient.
 
        
                    
             
        
        
        
1/2^3 = 1/2 x 1/2 x 1/2 = 1/8
Answer is C
        
             
        
        
        
we can use formula 

we can compare 
we get 
a=x
b=2
now, we can plug that in formula 
and we get 

now, we can simplify it 
 ...........Answer
...........Answer