Question:medium
If $S = \{ \theta \in [-\pi, \pi] : \cos\theta \cos\frac{5\theta}{2} = \cos 7\theta \cos\frac{7\theta}{2} \}$, then $n(S)$ is equal to :}
If $S = \{ \theta \in [-\pi, \pi] : \cos\theta \cos\frac{5\theta}{2} = \cos 7\theta \cos\frac{7\theta}{2} \}$, then $n(S)$ is equal to :}
Updated On: Apr 12, 2026
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Correct Answer: 21
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