Step 1: \ \

The trigonometric equation is $\"\"$ .

Find the solution of the equation.

$\"\"$

General solution for $\"\"$ : $\"\"$

$\"\"$

The solution of the equation $\"\"$

Step 2 :

Find the solution in the interval $\"\"$ .

$\"\"$ .

Substitute different values of $\"\"$ .

$\"\"$

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

$\"\"$

Solution :

(a) The solution of the equation $\"\"$

(b) The solution of the equation in the interval $\"\"$ is

$\"\"$