\

Step 1 :

\

Definition :

\

The derivative of a function f  with respect to x is denoted by \"\".

\

 \"\" if this limit exists.

\

Step 2 :

\

The function is \"\".

\

Find \"\" :

\

\"\"

\

The derivative of a function.

\

\"\"

\

Substitute the limit.

\

\"\"

\

\"\"

\

Solution :

\

\"\"