If θ is the second quadrant angle and cos θ / 2-sin θ / 2 = √ (1-2 sin θ cos θ), then what quadrant angle is θ / 2

If θ is the second quadrant angle and cos θ / 2-sin θ / 2 = √ (1-2 sin θ cos θ), then what quadrant angle is θ / 2

Theta is the second quadrant angle,
2kπ+π/2