JEE Math Practice Question
The number of solutions of the equation $ \cos 2\theta \cos \frac{\theta}{2} + \cos \frac{5\theta}{2} = 2\cos^3 \frac{5\theta}{2} $ in $ \left[ -\frac{\pi}{2}, \frac{\pi}{2} \right] $ is :
- A.5
- B.7
- C.6
- D.9
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