The trigonometric equation is .

Subtract from each side.

Apply zero product property.

or 

or 

or 

Since the range of sine function is , the equations and ields no additional solutions.

Solve .

Apply reciprocal identity : .

The general solution of is , where is an integer.

The solution is , where is an integer.

Now find the solutions on the interval .

If , .

If , .

Thus, the solutions are and on the interval .

The solutions of are and on the interval .