A) \[\left[ \frac{\pi }{4},\,\,\frac{\pi }{2} \right]\]
B) \[\left[ \frac{\pi }{2},\,\,\frac{3\pi }{2} \right]\]
C) \[\left[ \frac{\pi }{4},\,\,\frac{3\pi }{4} \right]\]
D) \[\left[ \frac{-\pi }{2},\,\,\frac{3\pi }{4} \right]\]
E) None of these
Correct Answer: C
Solution :
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