The trigonometric equation is and the interval is . \ \

Consider .

Apply double angle identity : .

\ \

\ \

\ \

and

and  .

Consider .

The general solution of is , where is an integer. \ \

The general solution is .

If , .

If , .

If , .

If , .

Thus, the solutions are and in the interval .

Consider .

The general solution of is , where is an integer. \ \

The general solution is .

If , .

If , .

If , .

Thus, the solutions of are , , and in the interval .

The solutions of are , , and in the interval .