The trigonometric equation is .

Factorize the above equation.

Apply zero product property.

or

or .

or .

Since is not a real number, the equation yields no additional solutions.

Solve .

and .

First solve .

or

or

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 , .

If , .

If , .

Thus, the solution is on the interval .

Now solve .

or

or

The solution is , where is an integer.

Find the solutions on the interval .

If , .

If , .

If , .

If , .

Thus, the solution is on the interval .

Therefore, the solutions of are and on the interval .

The solutions of are and on the interval .