A) \[\theta =2n\pi \]
B) \[\theta =\frac{2n\pi }{p\pm q}\]
C) \[\theta =\frac{n\pi }{p+q}\]
D) None of these
Correct Answer: B
Solution :
\[\cos p\theta =\cos q\theta \Rightarrow p\theta =2n\pi \pm q\theta \Rightarrow \theta =\frac{2n\pi }{p\pm q}\].
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