A \( \left ( 0 , \frac{\pi}{2} \right ) \)
B \( \left ( - \frac{\pi}{2} , 0 \right ) \)
C \( \left [ - \frac{\pi}{2} , \frac{\pi}{2} \right ] \)
D \( \left ( - \frac{\pi}{2} , \frac{\pi}{2} \right ) \)
Correct Answer: Option D
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