Step 1:

The trigonometric equation is $\"\"$ .

Take out common factors,

\"\"

General solution $\"\"$ :

If $\"\"$ , then $\"\"$ , where $\"\"$ is an integer.

\ $\"\"$ \

The general solution is $\"\"$

General solution $\"\"$ :

If $\"\"$ , then $\"\"$ , where $\"\"$ is an integer.

$\"\"$ .

The general solution is $\"\"$ .

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

$\"\"$

Solution:

The solutions are

$\"\"$