\ \

The Trigonometric function is .

Find the real zeros of the function, by equating on interval .

Apply double-angle formula: . \ \

Apply zero product rule.

and

and .

Solve .

The general solution of is , where is any integer.

For , .

For , .

For , .

Therefore, the solutions in the interval are .

Solve .

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

For , .

For , .

Therefore, the solutions in the interval are .

The real zeros of the function are .

The real zeros of the function are . \ \