The value of \( x \), between 0 and \( 2 \pi \), satisfying the equation \( \cos 3 x+\cos 2 x=\s...
The value of \( x \), between 0 and \( 2 \pi \), satisfying the equation \( \cos 3 x+\cos 2 x=\sin \frac{3 x}{2}+\sin \frac{x}{2} \)
(a) \( \frac{\pi}{7} \)
(b) \( \frac{5 \pi}{7} \)
(c) \( \frac{9 \pi}{7} \)
(d) \( \frac{13 \pi}{7} \)
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