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Maximum and minimum values of $\sin^2(120^{\circ} + \theta) + \sin^2(120^{\circ} - \theta)$ are respectively :


( A ) $\frac{3}{2}, 0$
( B ) $\frac{3}{2}, \frac{1}{2}$
( C ) $\frac{1}{2}, 0$
( D ) $\frac{3}{2}, \frac{1}{3}$

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