$\"\"$

The function is $\"\"$ .

Definite integral as area of the region:

If $\"\"$ is continuous and non-negative on the closed interval $\"\"$ , then the area of the region bounded by the graph $\"\"$ , the $\"\"$ -axis and the vertical lines $\"\"$ and $\"\"$ , then area $\"\"$ .

Observe the graph:

In this case $\"\"$ , $\"\"$ to $\"\"$ .

The area of the region bounded by the graph $\"\"$ , the $\"\"$ -axis and the vertical lines $\"\"$ and $\"\"$ , then area $\"\"$ .

$\"\"$

$\"\"$ .