The sum of all the solution of the equation
\( \mathrm{P} \)
\[
\co... VIDEO
The sum of all the solution of the equation
\( \mathrm{P} \)
\[
\cos x \cdot \cos \left(\frac{\pi}{3}+x\right) \cdot \cos \left(\frac{\pi}{3}-x\right)=\frac{1}{4}, x \in[0,6 \pi] \text { is }
\]
W
(a) \( 15 \pi \)
(b) \( 30 \pi \)
(c) \( \frac{110 \pi}{3} \)
(d) none of these
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