Step :1

The trigonometric equation is $\"\"$ .

$\"\"$ .

Let $\"\"$ .

$\"\"$

Substitute $\"\"$ above values.

$\"\"$ .

First equation $\"\"$ .

General solutions for $\"\"$ : $\"\"$ .

$\"\"$

Second equation $\"\"$ .

General solutions for $\"\"$ : $\"\"$ .

$\"\"$

The solution of the equation is $\"\"$

Step 2:

Solution of the equation in the interval is $\"\"$ .

$\"\"$

Substitute $\"\"$ in the solution of the equations.

$\"\"$ .

$\"\"$

The solution of the equation $\"\"$ .

Solution :

The solutions of the equation $\"\"$ .