$\"\"$

The trigonometric equation is $\"\"$ and the interval is $\"\"$ .

Related function is $\"\"$ .

Draw a coordinate plane.

Graph the function $\"\"$ .

Graph :

$\"\"$

Observe the graph of the function :

The graph of the function touches the $\"\"$ -axis at $\"\"$ and $\"\"$ .

Thus, $\"\"$ and $\"\"$ are the solutions of $\"\"$

in the interval $\"\"$ .

$\"\"$

The solutions of $\"\"$ are $\"\"$ and $\"\"$

in the interval $\"\"$ .