$\"\"$

The expression is $\"\"$ .

Rewrite the expression: $\"\"$

The expression represents the derivative of the function.

Limit definition of derivative at $\"\"$ : $\"\"$ .

Compare the limit expression with above definition.

Here the value of $\"\"$ is $\"\"$ and the function is $\"\"$ .

$\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ and $\"\"$ .