A) \[\theta =\frac{n\pi }{7}+\frac{\pi }{14}\]
B) \[\theta =\frac{n\pi }{7}+\frac{\pi }{5}\]
C) \[\theta =\frac{n\pi }{7}+\frac{\pi }{2}\]
D) \[\theta =n\,\pi +{{(-\,1)}^{n}}\,\,\frac{\pi }{3},n\in z\]
E) None of these
Correct Answer: A
Solution :
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