The trigonometric equation is $\"\"$ .

Simplify the trigonometric equation.

$\"\"$

Find all real number in the interval $\"\"$ .

General solution: $\"\"$ .

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

$\"\"$

General solution: $\"\"$

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

General solution: $\"\"$

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

All real solutions are

$\"\"$