Consider the polynomial \( \mathrm{P}(\mathrm{x})=\left(\mathrm{x}-...

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Consider the polynomial \( \mathrm{P}(\mathrm{x})=\left(\mathrm{x}-\cos 36^{\circ}\right)\left(\mathrm{x}-\cos 84^{\circ}\right)\left(\mathrm{x}-\cos 156^{\circ}\right) \)
The coefficient of \( \mathrm{x} \) is
\( \mathrm{P} \)
(A) \( \frac{3}{2} \)
(B) \( -\frac{3}{2} \)
(C) \( -\frac{3}{4} \)
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