Step 1:

The equation is $\"\"$ .

Consider the function is $\"\"$ .

Graph :

Graph the equation $\"\"$ :

$\"\"$

Observe the graph.

Locate the points where the line $\"\"$ touches the function $\"\"$ .

The points are $\"\"$ .

The general solution of $\"\"$ is $\"\"$ .

Therefore the solution of $\"\"$ is

$\"\"$

$\"\"$ where n is an integer.

Solution :

The general solution is $\"\"$ , where n is an integer.

The solution in the interval $\"\"$ are $\"\"$ .