$\"\"$

The trigonometric equation is $\"\"$ .

Add $\"\"$ to each side.

$\"\"$

Subtract 4 from each side.

$\"\"$

Apply reciprocal identity : $\"\"$ .

$\"\"$

$\"\"$ or $\"\"$

$\"\"$ or $\"\"$ .

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

The solutions are $\"\"$ or $\"\"$ , where $\"image\"$ is an integer. $\"\"$

The solutions are $\"\"$ or $\"\"$ , where $\"image\"$ is an integer.