A) \[\left( \frac{\pi }{6},\ \frac{5\pi }{6} \right)\]
B) \[\left( -1,\ \frac{5\pi }{6} \right)\]
C) \[(-1,\ 2)\]
D) \[\left( \frac{\pi }{6},\ 2 \right)\]
Correct Answer: D
Solution :
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