The equation is .

Subtract from each side.

Pythagorean identity : .

Apply zero product property.

or

or

or

Apply reciprocal identity : .

or

or .

No solution exist for .

Solve .

The general solution of is , where is an integer.

The solution is , where is an integer.

Find the solutions on the interval .

If , .

If , .

If , .

If , .

If , .

If , .

Thus, the solutions are , , , and on the interval .

Solve .

The general solution of is , where is an integer.

The solution is , where is an integer.

Find the solutions on the interval .

If , .

If , .

If , .

If , .

Thus, the solutions are , , , and on the interval .

The solutions are , , , , , , , and on the interval .