A) \[\left( -\pi ,\frac{-2\pi }{3} \right)\cup \left( 0,\frac{2\pi }{3} \right)\]
B) \[\left( -\pi ,\frac{-\pi }{3} \right)\cup \left( 0,\frac{\pi }{3} \right)\]
C) \[\left( \frac{-\pi }{2},\frac{\pi }{2} \right)\]
D) \[\left( -\pi \frac{-2\pi }{3} \right)\cup \left[ 0,\frac{2\pi }{3} \right]\]
Correct Answer: A
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