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Math Question

If the measure of angle \( \theta \) is \( \frac{2 \pi}{3} \), which statements are true? The measure of the reference angle is \( 45^{\circ} \). The measure of the reference angle is \( 60^{\circ} \). \( \sin (\theta)=-\frac{1}{2} \) The measure of the reference angle is \( 30^{\circ} \). \( \tan (\theta)=-\sqrt{3} \) \( \cos (\theta)=\frac{\sqrt{3}}{2} \)

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