The trigonometric equation is .

Apply sine half-angle identity : .

Apply cosine half-angle identity : .

Apply zero product property.

since , the equation has no solution.

Solve .

The solution is , where is an integer.

Now find the solutions on the interval .

If , .

If , .

Thus, the solutions are and on the interval .

Check :

Check the solution by substituting in .

Since the above statement is false, is not a solution of .

Check the solution by substituting in .

Since the above statement is true, is a solution of .

The solution of is on the interval .