$\"\"$

The trigonometric equation is $\"\"$ .

Consider $\"\"$ .

Apply difference formula : $\"\"$

$\"\"$ .

Find the interval :

One cycle :

$\"\"$

Graph :

Draw a coordinate plane.

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

$\"graph$ $\"\"$

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

$\"graph$