$\"\"$

The function is $\"\"$ .

The function $\"\"$ is continuous on the entire real line.

The function is continuous on $\"\"$ .

Second Fundamental Theorem of Calculus:

If $\"\"$ is continuous on an open interval $\"\"$ containing $\"\"$ , then, for every $\"\"$ in the interval, $\"\"$ .

$\"\"$

Apply derivative on each side with respect to $\"\"$ .

$\"\"$

Apply Second Fundamental Theorem of Calculus,then $\"\"$ . $\"\"$ .

$\"\"$

$\"\"$ .