$\"\"$

\

The function is $\"\"$ .

\

$\"\"$ .

\

Consider $\"\"$ .

\

The function is $\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

The integrand $\"\"$ is an odd function.

\

If $\"\"$ is an odd function, then $\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

Consider $\"\"$ .

\

The function is $\"\"$ .

\

Substitute $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

The integrand $\"\"$ is an even function.

\

If $\"\"$ is an even function, then $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .