$\"\"$

The trigonometric equation is $\"\"$ .

Consider $\"\"$ .

$\"\"$

Apply difference formula : $\"\"$ .

$\"\"$

$\"\"$

Graph :

Draw a coordinate plane.

Graph the function $\"\"$ in the interval $\"\"$ .

$\"graph$

$\"\"$

Graph of the function $\"\"$ is :

$\"graph$